• Write the safety communication setting to the Safety CPU after completing "Parameter write" to all safety
remote I/O modules connected. Failure to do so may cause an error (parameter mismatch of Safety CPU
and safety remote I/O module) in the Safety CPU at the restart of the safety remote I/O module.
• No restrictions are provided on the access level for writing parameters to the safety remote I/O module.
However, when the access level is "Users", even though parameters have been set to the safety remote I/O
module, safety communications are disabled because the safety communication setting cannot be set in the
Safety CPU. To perform the safety communications, set the setting with "Developers" or a higher access
level. For details on the access levels, refer to the following.
GX Works3 Operating Manual
• If the safety remote I/O module is left with "Safety module validation" not being performed for 10 minutes or
longer, a minor error (safety module validation not performed) occurs.
8 PARAMETER SETTINGS