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Title:
PROGRAMMABLE LOGIC CONTROLLER, SLAVE DEVICE, AND DUPLEX SYSTEM
Document Type and Number:
WIPO Patent Application WO/2016/170614
Kind Code:
A1
Abstract:
A programmable logic controller (10) includes: a state monitoring unit (12) for monitoring the state of another programmable logic controller (10), which is a counterpart for duplexing; and a system switching control unit (11) for sending to a slave device (103) status information including information that indicates whether a host station is a control system or a standby system, and if the host station is a control system, the system switching control unit receives control data that has been sent from the slave device (103) and addressed to the programmable logic controller (10) that is the control system, and if the host station is a standby system, the system switching control unit switches the host station to a control system if a failure is detected in the other programmable logic controller (10).

Inventors:
ANNEN KATSUHIRO (JP)
YAMAGIWA KATSUMI (JP)
Application Number:
JP2015/062236
Publication Date:
October 27, 2016
Filing Date:
April 22, 2015
Export Citation:
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Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
G06F11/20
Domestic Patent References:
WO2014147773A12014-09-25
Foreign References:
JP2002240713A2002-08-28
JP2010028712A2010-02-04
JP2006060704A2006-03-02
Attorney, Agent or Firm:
TAKAMURA, JUN (JP)
Jun Takamura (JP)
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