[Design Precautions]
!
DANGER
• Some faults of this module may keep the outputs on or off. An external monitoring circuit should
therefore be provided to check for output signals which may lead to a serious accident.
Not doing so can cause an accident due to mis-output or misoperation.
• If a communication error (including cable disconnection) occurs during monitoring with the GOT,
communication between the GOT and master station is interrupted, disabling operation.
When using the GOT to configure a system, assume that a GOT communication error will occur
and configure a system in which switches used to perform significant operation for the system
are provided on any device other than the GOT.
Not doing so can cause an accident due to mis-output or misoperation.
• Read Chapter 5 “Data Link Processing Time” in the Master Module User’s Manual carefully
regarding the status of each station when the PLC CPU operation is stopped or the data link
becomes a communication error.
Also, configure an interlocking circuit in the sequence program using the communication status
information (SB and SD) so that the overall system is always maintained.
An accident may occur by false output or malfunction.
• Received data form master or local data link faulty station.
1) Remote input (RX) and remote output
This varies depending on the setting of the module’s condition setting switch and input data
(SW4) of the data link faulty station.
OFF : CLEAR (all off)
ON : Keeps the data right before the error occurrence.
2) Remote registers (RWw and RWr)
The data right before the error is kept regardless of the SW4 setting.