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Patent Searching and Data


Title:
PROGRAMMABLE CONTROLLER SYSTEM
Document Type and Number:
Japanese Patent JP2007108923
Kind Code:
A
Abstract:

To immediately resume communication with a remote terminal device at a return from an error when high-order communication is intercepted by the error or the like in a PLC system which controls a plurality of remote terminal devices.

This programmable controller system has a programmable controller having a communicating function, and the remote terminal devices having communication units and I/O units. The communication unit of the remote terminal device has a normal communication state of carrying out I/O refresh processing with the programmable controller and I/O refresh processing with the I/O unit, and an idle state of carrying out only the presence confirmation of the connected I/O unit without transmitting/receiving I/O data, and changes between two communication states of the normal communication state and the idle state, based on predetermined conditions.


Inventors:
OZAKI TOSHIYUKI
UENO SHINTARO
Application Number:
JP2005000297591
Publication Date:
April 26, 2007
Filing Date:
October 12, 2005
Export Citation:
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Assignee:
OMRON TATEISI ELECTRONICS CO
International Classes:
G05B19/05
Attorney, Agent or Firm:
飯塚 信市