Patent ID: 8155762

Claim:
An instrumentation control system comprising a plurality of control devices performing control arithmetic processings and being connected to each other through a network wherein the respective control devices perform a data transmission through the network asynchronously with each other, and an unreliable information to distinguish whether a result of the control arithmetic processing is reliable or not is added at a time of data transmission, and wherein one control device from the plurality control devices includes: a reset switch; a reset instruction output unit to output an unreliability reset instruction to reset the unreliable information to the network for a preset period in response to an operation of the reset switch; and an unreliable information reset unit to stop input of the unreliable information from another control device for a preset period in response to the operation of the reset switch and to reset the unreliable information in said one control device, and a remaining control device from the plurality of control devices includes: a reset instruction reception monitor unit to monitor whether an unreliability reset instruction is received through the network or not; and an unreliable information reset unit to stop, when an unreliability reset instruction is received, input of the unreliable information from another control device for a preset period and to reset the unreliable information in said remaining control device.