Distributed control apparatus

Details Distributed control apparatus Distributed control apparatus

2006-04-05

2009-06-30

Wilson, Yolanda L (Department: 2113)

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

C714S004110, C370S248000, C370S251000

Reexamination Certificate

active

07555680

ABSTRACT:
A distributed control system includes a plurality of PLCs which are connected together via active and backup transmission lines which are opposite in transmission direction. Each of the PLCs includes a diagnosis command sending program for sending a diagnosis command, via a diagnosis-command transmission line, which is one of the active transmission line and the backup transmission line, to a PLC located downstream on the diagnosis-command transmission line; and an acknowledgment returning program, operable upon receipt of the diagnosis command, for returning an acknowledgement response for the diagnosis command, via an acknowledgment-response transmission line, which is the other of the active transmission line and the backup transmission line, to a PLC located downstream on the acknowledgment-response transmission line.

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