Mitsubishi Electric MELSEC iQ-R Series User Manual page 91

Safety station interlock function
1
If a communication error has occurred between safety stations, communication is automatically disconnected to prevent
incorrect input or output from the faulty station. Safety communications between the stations become safety station interlock
state at this time, and the safety communications do not resume until the safety interlock is released.
Create a program which releases the interlock by using Interlock release request for each safety connection to release the
safety station interlock state.
Note that standard communication automatically resumes if the communication error cause is eliminated even in the safety
station interlock state.
The safety station interlock function prevents equipment stopped by a communication error from suddenly resuming its
operation after it recovers from the error.
■ Checking method
Check the status with the safety special register 'Interlock status of each safety connection (1st module)' (SA\SD1232 to
SA\SD1239).
For the safety special register for the second or later modules and its operation details, refer to the following.
 MELSEC iQ-R CPU Module User's Manual (Application)
■ Release method
Release the interlock using the safety special register 'Interlock release request for each safety connection (1st module)'
(SA\SD1240 to SA\SD1247).
For the safety special register for the second or later modules and its operation details, refer to the following.
 MELSEC iQ-R CPU Module User's Manual (Application)
1 FUNCTIONS
89
1.7 Safety Communications