Precautions For Safety Functions Maintenance - Mitsubishi Electric MELSEC iQ-R Series Safety Manual

4.4

Precautions for Safety Functions Maintenance

Periodic inspection
Execute a periodic inspection to check whether the components such as emergency stop switch and safety sensor are not
faulty. As well as diagnostics of the safety programmable controller, perform a test from the emergency stop request to
machine stop as safety functions.
Module Replacement
For the safety programmable controller, execute the module/unit replacement according to the following replacement cycles.
Module
Safety CPU
Safety function module
Safety remote I/O module
Also replace module/unit and devices other than described above, according to the replacement cycle shown in the following
technical bulletin.
 Mitsubishi Electric TECHNICAL BULLETIN: Recommendation of preventive maintenance and inspection for MELSEC
programmable controllers
No.FA-A-0018-A
Safety operation mode while in operation
Set the safety operation mode to safety mode when in operation. Safety operation mode can be switched on the engineering
tool window from: [Online]  [Safety PLC Operation]  [Safety Operation Mode Switch]. For how to switch operation mode,
refer to the following.
 GX Works3 Operating Manual
 MELSEC iQ-R CPU Module User's Manual (Application)
Safety data identify check for Safety CPU
Periodically check if Safety CPU program or parameter is unauthorizedly altered, using safety data identify check. When
shifting to safety operation after writing the safety program and safety parameters to the Safety CPU, use an engineering tool
to refer to the safety data identify check data, and record the data in a separate manner.
• Periodically refer to the engineering tool safety data identify check information to make sure that no unauthorized
alterations take place.
• If unauthorized alternation is found, stop operation. Restore proper project using backup project file.
For the safety data identify check, refer to the following.
 MELSEC iQ-R CPU Module User's Manual (Application)
Protecting data
The project file and Safety CPU of the engineering tool are protected by the password required for user authentication.
Manage the registered password properly and do not leak the password except authorized person to prevent the
unauthorized access. For the user authentication function, refer to the following.
 GX Works3 Operating Manual
4 PRECAUTIONS FOR USE OF SAFETY PROGRAMMABLE CONTROLLER
50
4.4 Precautions for Safety Functions Maintenance
Module replacement cycle
10 years
10 years
5 years