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[Design Precautions]]
DANGER
Some failures of the GOT, communication unit, communication board or cable may keep the outputs
on or off.
An external monitoring circuit should be provided to check for output signals which may lead to a
serious accident.
Not doing so can cause an accident due to false output or malfunction.
If a communication fault (including cable disc onnection) occurs during monitoring on the GOT,
communication between the GOT and PLC CPU is suspended and the GOT becomes inoperative.
For bus connection : The CPU becomes faulty and the GOT becomes inoperative.
For other than bus connection : The GOT becomes inoperative.
A system where the GOT is used should be configur ed to perform any significant operation to the
system by using the switches of a device ot her than the GOT on the assumption that a GOT
communication fa ult will occur.
Not doing so can cause an accident due to false output or malfunction.
Do not use the GOT as the warning device that may cause a serious accident.
An independent and redundant hardware or mechanical interlock is required to configure the device
that displays and outputs serious warning.
Failure to observe this in struction may result in an accident due to incorrect output or malfunction.