Precautions For Safety Functions Maintenance - Mitsubishi Electric MELSEC-QS Series Safety Application Manual

4
PRECAUTIONS FOR USE OF SAFETY
PROGRAMMABLE CONTROLLER
4.4

Precautions for Safety Functions Maintenance

(1) Periodic inspection
To confirm whether the emergency stop switch, safety sensor, etc. are not faulty,
execute a periodic inspection every one year for meeting Category 3, every six
months for meeting Category 4.
As well as diagnostics of the safety programmable controller, perform a test from the
emergency stop
request to machine stop as safety functions.
(2) Module/unit replacement
For the safety programmable controller, execute the module/unit replacement
according to the replacement cycle in Table 4.7.
Safety power supply module
Safety CPU module
Safety main base unit
CC-Link Safety master module
CC-Link Safety remote I/O module
CC-Link IE Field Network master/local
module (with safety functions)
(3) Safety CPU operation mode while a safety programmable controller is in
operation
Set the safety CPU operation mode of the safety programmable controller to SAFETY
MODE when the programmable controller is in operation.
(4) ROM information management of a safety CPU module
Confirm the ROM information at regular intervals whether the programs and
parameters in the safety CPU module are illegally rewritten.
For checking ROM information, refer to the following.
(5) Password management
The project files for GX Developer and safety CPU module are protected by
password.
Manage the registered password properly and do not leak the password except
authorized person in order to prevent the unauthorized access.
Table 4.7 Module/unit replacement period
Module/unit
1) When writing a project file to ROM, check the ROM information using GX
Developer, and separately save the information.
2) With reference to the ROM information of GX Developer at regular intervals,
confirm whether the information is illegally rewritten.
3) When the information is illegally rewritten, stop the operation.
Then, recover the project using the backup project file.
GX Developer Version 8 Operating Manual (Safety Programmable Controller)
4.4 Precautions for Safety Functions Maintenance
Module/unit replacement cycle
5 years
10 years
10 years
10 years
5 years
10 years
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2
3
4
5
6
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