Mitsubishi Electric MELSEC iQ-R Series User Manual page 91

Precautions
• If an error occurs in safety communications, safety data from the faulty station is cleared.
• A safety connection with the safety station can be established only while data link is performed after configuring the "Safety
Communication Setting" under "Basic Settings" of the master station. The data link status can be checked in 'Data link
status of each station' (SW00B0 to SW00B7).
• Note that stations not set in "Network Configuration Settings" under "Basic Settings" of the master station (safety station)
and reserved stations cannot perform safety communications.
• Safety communications cannot be performed among the RJ71GN11-T2s set in the same control CPU.
• This function may detect an error and stop safety communications if a parameter is written to the control CPU of the
RJ71GN11-T2 during safety communications.
• Safety communications cannot be performed among the safety stations when the IP address and model name of the
communication destination set to the safety station are different from the actual system configuration.
• Safety communications cannot be performed with a remote station (safety station) if the safety approval code set in the
master station (safety station) and it in the remote station (safety station) are not match.
• An error occurs when a parameter is written to the Safety CPU because the Safety CPU does not support the inter-module
synchronization function.
• A remote device test cannot be used for a safety remote I/O module.
Safety station interlock function
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
1.7 Safety Communications
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