REMOTE SURVEILLANCE AND CONTROL MODULE

The present invention relates to a remote surveillance and control module comprising internal electrical sources for supplying power both for the operation of the sensors and the operation of the devices connected electrically to the inputs and outputs of this module.

Remote surveillance and control modules are widely used in a large number of applications, such as for monitoring and managing infrastructure in pumping stations, telecommunications base stations, data centres, etc. They are the means for two-way data transfer between sensors and devices which are electrically connected to the respective inputs and outputs of each of these modules and at least one host computer managing all these modules.

A simple form remote surveillance and control module includes, inter alia, at least one microcontroller submodule equipped with appropriate firmware to which all inputs, coils of relays of all outputs and all communication ports of the module are connected, as well as a number of dry contact type digital inputs, a number of analogue inputs, a number of two way communication ports through standard protocols, such as RS232 serial protocols, etc., to which respective type sensors and devices can be electrically connected, at least one LAN (Local Area Network) communication port for the connection, through network, and two-way data transfer between these modules and the host computer, which is equipped with an appropriate software. Finally, it also includes a number of electric dry contact type outputs to which various devices are connected for handling purposes.

A simple example is the installation of a remote surveillance and control module to monitor the temperature of a room so that in case of exceeding a predetermined temperature limit, a DC electric fan can be activated by a proper command from the host computer unit. This is achieved by electrical connection of an electrical temperature sensor to one of the analogue inputs of the module and an electric fan to one of the outputs of the same module. If the sensor detects a higher temperature value than the preset one, the host computer unit is automatically updated by the remote surveillance and control module regarding this value exceedance, the computer activating the electric fan by providing a relevant electronic command deriving either by the supervising operator or even automatically through the software installed on this host computer unit. However, both the temperature sensor operation and the electric fan operation require power supply. In most cases a different power supply is required for each sensor type and for each device type. For example, operation of a temperature sensor may require a 5VDC power supply source, while a respective type fan may require a 12VDC source to operate. As a result, there is a need to use additional external equipment, such as the additional equipment needed in this case and relating to two separate power supply units, the first one for the sensor operation and the second one for the fan operation. It is evident the need to install and use such electrical sources depending on the number of inputs and outputs included in each remote surveillance and control module in order to allow the connection of many and different type sensors, as well as of many and different type electrical devices.

The object of the present invention is to provide a remote surveillance and control module that will configure the electrical characteristics of each digital and analogue type input and output, so that, following a relevant choice, either a dry contact type function or power supply function is created, enabling to select the output value of any such power supply without the need for additional external equipment.

According to the present invention this is achieved by incorporating DC voltage sources (VDC) inside the remote surveillance and control module, with a view to configuring, with appropriate combinations of electrical bridges at different points of the circuit of each digital and analogue input and output of the module, either a dry contact function for connecting sensors and devices that do not require an electrical supply or a direct current supply (VDC) for connecting sensors and devices requiring power supply, or combinations of both aforementioned functions. Each DC voltage source (VDC) will either provide a constant output value but different from the other ones integrated within the same module in order to achieve the desirable value by selecting the suitable electrical bridges, or a variable value to provide more accurate output values, which could be adjusted either locally or remotely, via the same module's microprocessor submodule, so that the desirable value can be configured each time, with the view to meeting the power supply requirements of a wide range of sensors and devices.

Figure 1 shows one of the analogue or digital inputs of the remote surveillance and control module to which either a passive type external sensor (A) can be connected via only two electrical conductors (Al) and (A2), given that no power supply is required for such type sensors, or an active type external sensor (A) requiring power supply and using three electrical conductors (Al), (A2) and (A3), which are electrically connected through the connector (B) terminals to an input of the microcontroller submodule (M). Also included are electrical conductors (1 ), (2), (3), (4), (5), (6), (7), (8), (9), (Ml), (M2), ( M3), (M4), a single-pole single throw (SPST) relay (H), with a coil (P), a direct current source (VDC) of output voltage constant value (Tl), with a negative pole (T1A) ) and a positive pole (TIB), a connector (B l) of two electrical terminals to which an electrical device (I) is connected via the electrical conductors (II) and (12) and the positions of the electrical bridges (Kl), (K2), ( K3), (K4) and (K5), of which the appropriate ones are used each time to configure each time the function type of each analogue or digital input and output.

Example of wiring 1

To connect a passive type sensor (A) and the device (I) requiring no power supply the following electrical wiring is formed. The sensor (A) uses only two electrical conductors (Al) and (A2), as the (A3) does not exist due to the sensor type, which are electrically connected in series through two of the three connector (B) terminals, with the conductors (Ml) and (M2) respectively, terminating in the submodule (M). The electrical conductor (Ml) is the submodule's (M) input receiving the output signals from the sensor (A) and the electrical conductor (M2) is the zero potential (0 VDC) negative supply pole of the same submodule (M). The source (Tl) as well as the electrical conductors (1), (2), (3), (4), (5), (6) remain on the electronic circuit board without connection, the electrical bridges ( K2), (K3), (K4) and (K5) not being used for this wiring. The device (I) is connected through the electrical conductors (II) and (12) to the electrical terminals of the connector (Bl). The conductor (II) in series with the conductor (9) leads to the mobile contact of the relay (H) and the conductor (12) through the conductor (8), the electrical bridge (Kl) and the conductor (7) leads to the fixed contact of the relay (H), and the coil (P) of the relay (H) is connected via the conductors (M3) and (M4) to the output of the submodule (M). In this way, upon activation of the relay (H), the dry contact function of the device (I) is achieved.

Example of wiring 2

The following electrical wiring is configured to connect a passive type sensor (A) requiring no power supply and a device (1) requiring a power supply.

The sensor (A) uses only two electrical conductors (Al) and (A2), given that the (A3) does not exist due to the type of sensor, which are electrically connected in series, through two of the three connector (B) terminals, with the conductors (Ml) and (M2) respectively, ending in submodule (M). The conductor (Ml) is the input of the submodule (M) receiving the output signals from the sensor (A) and the conductor (M2) is the zero potential (0 VDC) negative pole of the same submodule (M).

The electrical conductors (1), (2), and (5) remain no connected on the electronic circuit board, and the electrical bridges (Kl), (K4) and (K5) are not used for this wiring. The device (I) is connected via the electrical conductors (II) and (12) to the electrical terminals of the connector (Bl). The conductor (II) is connected in series to the conductor (9) by means of an electrical terminal of the connector (Bl) leading to the mobile contact of the relay (H). The conductor (12) is connected via the second electrical connector (Bl) terminal in series to the conductors (8) and (6) of the electrical bridging (K2) and the conductor (3) terminating at the negative pole (T1A) of the source (Tl). The positive pole (TIB) of the source (Tl) is connected through the conductor (4), the bridge (K3) and the conductor (7) and ends up in the fixed contact of the relay (H), whose coil (P) is connected through the conductors (M3) and (M4) to the output of the submodule (M). In this way and upon activation of the relay (H), the power supply function for device (I) is achieved, the positive pole (TIB) of the source (Tl) appearing in the conductor (II).

Example of wiring 3

To connect an active type sensor (A) requiring no power supply and a device (I) requiring power supply the following electrical wiring is configured.

The sensor (A) uses all three electrical conductors (Al), (A2) and (A3) of which (Al) and (A2) are electrically connected in series, through two of the three connector (B) terminals with the conductors (Ml) and (M2) respectively ending up in submodule (M). The electrical conductor (Ml) is the input of the submodule (M) receiving the output signals from the sensor (A) and the electrical conductor (M2) is the zero potential (0 VDC) negative pole of the same submodule (M). The conductor (A3) is connected via the third terminal of the connector (B), the conductor (5) and the electrical bridging (K5) to the positive pole (TIB) of the source (Tl), while the negative pole (T1A) of the same source (Tl) is connected via the conductor (2) to the electrical bridging (K4) and the conductor (1) to the conductor (M2), providing power to the sensor (A).

The electrical conductors (3), (4) and (6) remain unconnected on the electronic circuit board, the electrical bridges (K2) and (K3) not being used for this wiring.

The device (I) is connected via the electrical conductors (II) and (12) to the electrical terminals of the connector (Bl). The conductor (II) is connected in series with the conductor (9) leading to the mobile contact of the relay (H) and the conductor (12) through the conductor (8), the electrical bridging (Kl) and the conductor (7) to the fixed contact of the relay (H). The relay (H) coil is connected via the conductors (M3) and (M4) to an output of the submodule (M). In this way, upon activation of the relay (H), the dry contact function for the device (I) is achieved.

Example of wiring 4

To connect an active type sensor (A) requiring power supply and a device (I) also requiring power supply the following electrical wiring is configured.

The sensor (A) uses all three electrical conductors (Al), (A2) and (A3) of which (Al) and (A2) are electrically connected in series, through two of the three connector (B) terminals, with the conductors (Ml) and (M2) respectively terminating in submodule (M). The electrical conductor (Ml) is an input of the submodule (M) receiving the output signals from the sensor (A) and the electrical conductor (M2) is the zero potential (0 VDC) negative supply pole of the same submodule (M). The conductor (A3) is connected via the third terminal of the connector (B), the conductor (5) and the electrical bridging (K5) to the positive pole (TIB) of the source (Tl), while the negative pole (T1A) of the same source (Tl) is connected via the conductor (2) of the electrical bridging (K4) and the conductor (1) to the conductor (M2) providing power to the sensor (A).

The electrical bridging (Kl) does not exist while the device (I) is connected via the electrical conductors (II) and (12) to the electrical terminals of the connector (Bl). The conductor (II) is connected in series with the conductor (9) leading to the mobile contact of the relay (H) and the conductor (12) is connected through the conductors (8) and (6), the electrical bridging (K2) and the conductor (3) to the negative pole (T1A) of the source (Tl), and the positive pole (TIB) of the source (Tl) is connected via the conductor (4), the bridging (K3) and the conductor (9) to the fixed contact of the relay (H), whose coil (P) is connected via the conductors (M3) and (M4) to an output of the submodule (M). In this way, and upon activation of the relay (H), the power supply function for the device (I) is achieved, the positive pole (TIB) of the source (Tl) being in the conductor (II). Figure 2 shows what is shown in Figure 1 with the additional elements of a second supply source (T2) of direct and constant output voltage value (VDC), different from the value of the source (Tl), with a negative pole (T2A) and a positive pole (T2B), a conductor (II) and electrical bridges (K6), (K7) and (K8), so that in combination with the other bridges (Kl), (K2), (K3), (K4) and (K5) all possible connections can be provided to create the appropriate connections for switching the (Tl) and (T2) sources’ connection with the sensor (A) and the device (I), as well as the wirings for dry contact type functions.

Figure 3 shows an analogue or digital input of a remote surveillance and control module capable of connecting with either a passive or an active external sensor (A), as well as capable of either dry contact or power supply function regarding the device (I). All combinations of activation/deactivation of the relays (FI), (HI), (H2) as well as the change in source (Tl) output value are achieved either locally or remotely by programming the electronic microcontroller (M).

It includes a sensor (A), a device (I), a three electrical terminal connector (B), a two electrical terminal connector (Bl), a single pole single throw (SPST) relay (H) with a coil (P), a dual pole single throw (DPST) relay (HI) with a coil (PI), a dual pole dual throw (DPDT) relay (H2) with a coil (P2), an electronic microcontroller (M), a direct but variable output voltage (VDC) supply source (Tl), with a negative pole (T1A) and a positive pole (TIB) and the conductors (Al), (A2), (A3), (II) , (12), (Ml), (M2), (M3), (M4), (M5), (M6), (M7), (M8), (TIP), (2), (3), ( 4), (5), (7), (8), (9) and (10).

Wiring example and possible function combinations

The sensor (A) may be of either passive type using only two conductors (Al) and (A2) for its connection given that (A3) does not exist due to the sensor type, or of active type using all three conductors (Al), (A2) and (A3), which are connected through the electrical terminals of the connector (B). The conductors (Ml) and (M2) connected in series to the conductors (Al) and (A2) of the sensor (A) terminate in the submodule (M). The electrical conductor (Ml) is the input of the submodule (M) receiving the output signals from the sensor (A) and the electrical conductor (M2) is the zero potential (0 VDC) negative supply pole of the same submodule (M).

The positive pole (TIB) of the source (Tl) is connected on the one hand with the fixed contact of the one part of the relay (HI), on the other hand through the conductor (4) with one fixed contact of the one part of the relay (H2). The negative pole (T1A) of the source (Tl) is connected on the one hand with the fixed contact of the second part of the relay (HI), on the other hand through the conductor (3) with one fixed contact of the second part of the relay (H2). The conductor (TIP) which is the control point for the source (Tl) output value is connected to the output of the submodule (M). The conductor (5) connects the third connector (B) terminal to the respective mobile contact of one part of the relay (HI) and the conductor (2) connects the respective mobile contact of the second part of relay (HI) to the conductor (M2), and the coil of the same relay (PI) is connected to submodule (M) outputs through the conductors (M7) and (M8). The conductor (II) of the device (I) is connected through an electrical connector (Bl) terminal to one end of the conductor (9) the other end of which is connected to the mobile contact of the relay (H), while the second conductor (12) of the device (I) is connected via the second electrical connector (Bl) terminal to one end of the conductor (8) whose other end is connected to the mobile contact of the second part of the relay (H2), while the second mobile contact of the other part of the same relay (H2) is connected through the conductor (7) to the fixed contact of the relay (H), of which the coil (P) is connected to the output of the submodule (M) via the conductors (M3) and (M4). The second fixed contacts of both parts of the relay (H2) are connected to each other via the conductor (10), while the coil (P2) of the same relay (H2) is connected via the conductors (M5) and (M6) to a submodule (M) output.

Through the above wiring, the following types of functions are achieved

A) Connection of a passive type sensor (A) having only two connection conductors (Al), (A2) and requiring power supply to operate and a device (I) requiring dry contact type function This type of function is achieved when the relay (HI) is switched off so that no connection is made between its fixed and movable contacts, so that no supply voltage is present at the third connector (B) terminal.

The relay (H2) is also deactivated but its mobile contacts create a connection to the respective fixed ones, which are connected to each other through the conductor (10), then connecting on the one side the conductor (8) leading to a terminal of the connector (B l) to which the conductor (12) of the device (I) is connected and on the other side the conductor (7) with the fixed contact of the relay (H), which when activated creates a connection between its fixed and mobile contact, to which the conductor (9) is connected, leading to the other terminal of the connector (Bl) and, thereby, to the conductor (II) of the device (I), showing dry contact function at the terminals of the connector (Bl) and hence at the conductors (II) and (12) of the device (I)

B) Connection of a passive type sensor (A) having only two connection conductors (Al), (A2), the operation of which requires no power supply and a device (I) the operation of which requires power supply

This type of function is achieved when the relay (HI) is switched off so that no connection is made between its fixed and movable contacts, resulting in the absence of supply voltage at the third connector (B) terminal. The relay (H2) is activated providing connection between the fixed and the corresponding mobile contact of one part thereof, connecting the negative pole (T1A) of the source (Tl), through the conductor (3), to the fixed contact of the relay (H2) and the conductor (8) the one end of which is connected to the movable contact of the same part of the relay (H2) and the other end terminates to an electrical connector (Bl) terminal to which the conductor (12) of the device (I) is connected, the negative pole (Tl A) of the source (Tl) appears in the conductor (12). The positive pole (TIB) of the same source (Tl), connected through the conductor (4) to the other fixed contact of the second part of the relay (H2), whose the respective mobile contact is connected through the conductor (7) to the fixed contact of relay (H), which, upon activation of this relay (H), creates a connection between its movable and fixed contact, so that through the conductor (9) the positive pole (TIB) of the source (Tl) is shown at the other terminal of the connector (Bl) and hence at the conductor (II) of the device (I).

The output of the source is programmed through the conductor (TIP) which connects the source (Tl) to the submodule (M) in order to provide the value required for the operation of the device (I).

C) Connection of an active type sensor (A) having three connection conductors (Al), (A2), (A3), whose operation requires power supply and a device (I) which does not require power supply but dry contact function.

This type of function is achieved when the relay (HI) is switched on, providing connection on the one hand through the fixed contact of a part thereof to which the negative pole (T1A) of the source (Tl) is connected and the respective mobile contact to which the conductor (2) is connected with the conductor (M2), showing the negative pole (T1A) of the source (Tl) on that conductor (M2). On the other hand, through the fixed contact of its second portion to which the positive pole (TIB) of the source (Tl) is connected and the respective mobile contact to which the conductor (5) is connected with the connector (B) terminal to which the conductor (A3) of the sensor (A) is connected, showing the positive pole (TIB) of the source (Tl) on this conductor (A3).

Through the conductor (TIP) by which the source (Tl) is connected to the submodule (M) the output of the source is programmed in order to provide the value required for sensor (A) operation. The relay (H2) is switched off but its mobile contacts provide connection with the respective fixed ones, which are connected to each other via the conductor (10), then connecting on the one side the conductor (8) leading to the one terminal of the connector (Bl) to which the conductor (12) of the device (1) is connected and on the other side the conductor (7) with the fixed contact of the relay (H), which when activated creates a connection between its fixed and mobile contact, to which the conductor (9) is connected, terminating in the other terminal of the connector (Bl) and thereby, in the conductor (II) of the device (I), showing a dry contact function at the connector (Bl) terminals and hence at the conductors (II) and (12) of the device (I)

D) Connection of an active type sensor (A) having three connection conductors (Al), (A2), (A3) whose operation requires power supply and a device (I) whose operation also requires power supply

This type of operation is achieved when the relay (HI) is switched on, creating connection on the one hand through the fixed contact of its one part to which the negative pole (T1A) of the source (Tl) is connected and the respective mobile contact to which the conductor (2) is connected with the conductor (M2), showing the negative pole (T1A) of the source (Tl) on that conductor (M2). On the other hand, through the fixed contact of its second portion to which the positive pole (TIB) of the source (Tl) is connected and the respective mobile contact to which the conductor (5) is connected with the connector (B) terminal to which the conductor (A3) of the sensor (A) is connected, showing on this conductor (A3) the positive pole (TIB) of the source (Tl).

The relay (H2) is activated, creating connection between the fixed and the respective mobile contact of one part thereof, connecting the negative pole (T1A) of the source (Tl), through the conductor (3) to the fixed contact of the relay (H2) and the conductor (8), the one end of which is connected to the mobile contact of the same portion of the relay (H2) and the other end terminates in an electrical terminal of the connector (Bl) to which the conductor (12) of the device (I) is connected, showing the negative (T1A) of the source (Tl) in the conductor (12). The positive pole (TIB) of the same source (Tl), connected through the conductor (4) to the other fixed contact of the second part of the relay (H2), whose respective mobile contact is connected through the conductor (7) to the fixed contact of relay (H), which, upon activation of this relay (H), creates a connection between its movable and fixed contact, so that through the conductor (9) the positive pole (TIB) of the source (Tl) is shown at the other terminal of the connector (Bl) and hence at the conductor (II) of the device (I).

Through the conductor (TIP) that connects the source (Tl) to the submodule (M), the source output is programmed to provide the required value, which is the same, for the operation of the sensor (A) and the device (I).

Figure 4 shows an analogue or digital input of a remote surveillance and control module capable of connecting with either a passive or active type external sensor (A), thus enabling a dry contact or power supply function for the operation of the device (I). All functions, that is, the activation and deactivation of all relays (H), (HI ), (H2) and combinations between them, as well as the variation of the sources' (Tl) and (T2) output values are achieved either locally or remotely by programming the electronic microcontroller (M). Moreover, it includes a sensor (A), a device (I), a connector of three electrical terminals (B), a connector of two electrical terminals (Bl), a single pole single throw relay (H) with a coil (P), a dual pole single throw relay (HI ) with a coil (PI), a dual pole dual throw relay (H2) with a coil (P2), an electronic microcontroller submodule (M), a direct but variable output voltage (VDC) power supply (Tl), with a negative pole (T1A) and a positive pole (TIB), a second source (T2) of direct but variable output voltage (VDC), with a negative pole (T2A) and a positive pole (T2B) and the conductors (Al), (A2), (A3), (II), (12), (Ml), (M2) , (M3), (M4), (M5), (M6), (M7), (M8), (TIP), (T2P), (2), (5), (7), (8), ( 9), and (10)

Example of wiring and possible function combinations

The sensor (A) may be of either passive type using only the two conductors (Al) and (A2) for its connection given that (A3) does not exist due to the sensor type, or may be of active type using all three conductors (Al), (A2) and (A3), which are connected through the electrical terminals of the connector (B). The conductors (Ml) and (M2) connected in series to the conductors (Al) and (A2) of the sensor (A) terminate in the submodule (M). The electrical conductor (Ml) is the input of the submodule (M) receiving the output signals from the sensor (A) and the electrical conductor (M2) is the zero potential negative pole (0 VDC) of the same submodule (M). The positive pole (TIB) of the source (Tl) is connected to the fixed contact of one part of the relay (HI) and the negative pole (T1A) of the source (Tl) is connected to the fixed contact of the second part of the relay (HI). The conductor (TIP) which is the control point for the source (Tl) output value is connected to the output of the submodule (M). The conductor (5) connects the third connector (B) terminal to the respective mobile contact of the one part of the relay (HI) and the conductor (2) connects the respective mobile contact of the second part of the relay (HI) to the conductor (M2), and the coil of the same relay (PI) is connected to submodule (M) outputs through the conductors (M7) and (M5). The conductor (II) of the device (I) is connected via an electrical connector (Bl) terminal to one end of the conductor (9), the other end of which is connected to the mobile contact of the relay (H), the second conductor (12) of the device (I) being connected through the second electrical connector (Bl) terminal to one end of the conductor (8) whose other end is connected to the mobile contact of the second part of the relay (H2), the second mobile contact of the other part of the same relay (H2) being connected through the conductor (7) to the fixed contact of the relay (H), whose coil (P) is connected to the output of the submodule (M) via the conductors (M3) and (M4). The second fixed contacts of both relay's (H2) parts are connected to each other via the conductor (10), while the coil (P2) of the same relay (H2) is connected via the conductors (M5) and (M6) to an output of the submodule (M). The positive pole (T2B) of the source (T2) is connected to the fixed contact of one part of the relay (H2) and the negative pole (T2A) of the source (T2) is connected to the fixed contact of the second part of the relay (H2). The conductor (T2P) which is the control point for the source (T2) output value is connected to an output of the submodule (M).

Through the above wiring, the following types of functions are achieved:

A) Connection of a passive type sensor (A) having only two connection conductors (Al), (A2), whose operation does not require power supply and a device (1) that requires the creation of a dry contact function

This type of operation is achieved when the relay (HI) is switched off so that no connection is made between its fixed and mobile contacts, resulting in no supply voltage presence at the third connector (B) terminal.

The relay (H2) is also deactivated but the mobile contacts thereof create connection with the respective fixed ones, which are connected to each other through the conductor (10), on the one side connecting the conductor (8) leading to a terminal of the connector (B l) to which the conductor (12) of the device (I) is connected and on the other side the conductor (7) with the fixed contact of the relay (H), which when activated creates connection between its fixed and mobile contact, to which the conductor (9) is connected, which terminates to the other connector (Bl) terminal and thereby to the conductor (II) of the device (1), showing a dry contact function at the terminals of the connector (Bl) and hence at the conductors (II) and (12) of the device (I).

B) Connection of a passive type sensor (A) having only two connection conductors (Al), (A2) for the operation of which no power supply is required and the device (1) whose operation requires power supply.

This type of operation is achieved when the relay (HI) is switched off so that no connection is made between its fixed and mobile contacts, resulting in no supply voltage presence at the third connector (B) terminal. The relay (H2) is activated, creating connection between the fixed and the respective mobile contact of one part thereof, connecting the negative pole (T2A) of the source (T2), with the fixed contact of the relay (H2) and the conductor (8), one end of which is connected to the mobile contact of the same portion of the relay (H2) and the other end terminates in an electrical terminal of the connector (Bl) to which the conductor (12) of the device (I) is connected, the negative pole (T2A) of the source (T2) is shown on the conductor (12). The positive pole (T2B) of the same source (T2), connected to the other fixed contact of the second part of the relay (H2), whose the respective mobile contact is connected through the conductor (7) to the fixed contact of the relay (H) , which, upon activation of this relay (H), creates a connection between its mobile and constant contact, so that through the conductor (9) the positive pole (T2B) of the source (T2) is displayed at the other terminal of the connector (Bl) and hence at the conductor (II) of the device (I), too.

Finally, through the conductor (T2P) that connects the source (T2) to the submodule (M) the source output is programmed to provide the value required for the operation of the device (I).

C) Connection of an active type sensor (A) having three connection leads (Al), (A2), (A3) and whose operation requires power supply and a device (I) that does not require power supply but creation of dry-type function

This type of operation is achieved when the relay (III) is switched on, creating connection on the one hand through the fixed contact of its one part to which the negative pole (T1A) of the source (Tl) is connected and the respective mobile contact to which the conductor (2) is connected, showing the negative pole (T1A) of the source (Tl) in that conductor (M2). On the other hand, through the fixed contact of its second portion to which the positive pole (TIB) of the source (Tl) is connected and the respective mobile contact to which the conductor (5) is connected, with the connector (B)terminal to which the conductor (A3) of the sensor (A) is connected, showing the positive pole (TIB) of the source (Tl) on this conductor (A3) .

Finally, through the conductor (TIP) that connects the source (Tl) to the submodule (M) the source output is programmed to provide the value required for the operation of the sensor (A).

The relay (H2) is deactivated but the mobile contacts thereof create connection with the respective fixed ones, which are connected to each other through the conductor (10), then connecting on the one side the conductor (8) leading to one connector (Bl) terminal on which the conductor (12) of the device (1) is connected and on the other side the conductor (7) with the fixed contact of the relay (H), which when activated creates a connection between its fixed and mobile contact, to which the conductor (9) is connected, the latter leading to the other connector (Bl) terminal and, thereby, to the conductor (II) of the device (I), displaying dry contact function on the connector (Bl) terminals and hence on the conductors (II) and (12) of the device (I).

D) Connection of an active type sensor (A) having three connection leads (Al), (A2), (A3) for operation of which power supply is required and a device (I) whose operation also requires power supply.

This type of operation is achieved when the relay (HI) is switched on, generating a connection on the one hand through the fixed contact of one part thereof to which the negative pole (T1A) of the source (Tl) is connected and the respective mobile contact to which the conductor (2) is connected with the conductor (M2), showing the negative pole (T1A) of the source (Tl) in that conductor (M2). On the other hand, through the fixed contact of its second portion connected to the positive pole (TIB) of the source (Tl) and the respective mobile contact connected to the conductor (5) with the connector (B) terminal to which the conductor (A3) of the sensor (A) is connected, showing in this conductor (A3) the positive pole (TIB) of the source (Tl).

The relay (H2) is activated, creating a connection between the fixed and the respective mobile contact of one part thereof, connecting the negative pole (T2A) of the source (T2) to the fixed contact of the relay (H2) and the conductor (8), whose one end is connected to the mobile contact of the same portion of the relay (H2) and the other end terminates to the electrical terminal of the connector (Bl) on which the conductor (12) of the device (I) is connected, the negative pole (T2A) of the source (T2) is shown in the conductor (12). The positive pole (T2B) of the same source (T2), connected to the other fixed contact of the second part of the relay (H2), whose the respective mobile contact is connected through the conductor (7) to the fixed contact of the relay (H), which, upon activation of this relay (H), creates a connection between its mobile and fixed contact, so that through the conductor (9) the positive pole (T2B) of the source (T2) is displayed at the other terminal of the connector (Bl) and hence and at the conductor (II) of the device (I), too.

Moreover, through the conductor (TIP) that connects the source (Tl) to the submodule (M), the source output is programmed to provide the required value for the operation of the sensor (A), while through the conductor (T2P) which connects the source (T2) to the module (M), the output of the source is programmed to provide the required value for the operation of the device (I).