Memory Check Function; Internal Processing Check Of Safety Observation Function - Mitsubishi Electric MELSEC Q Series Programming Manual

2 SAFETY OBSERVATION FUNCTION
Without output off check, safety cannot be secured because a transistor failure of safety signal
module cannot be detected, and safety signals may not be turned OFF.
When the output off check is executed, all output signal points of safety signal module are
turned OFF. Make sure to create the sequence so that the machine safety can be ensured
even when all the output signals are OFF.

2.10.2 Memory Check Function

2.10.3 Internal processing check of Safety observation function

Execute the memory check of PLC CPU device memory and Motion CPU internal
memory for safety observation process constantly after power supply ON.
If an error is detected during PLC CPU side memory check, "Safety observation error
(error code: 46)" occurs, and "Safety observation error (error code: 47)" occurs during
the check of the Motion CPU side.
No particular precaution is given for parameter setting and the program creation of this
function.
Execute the following check to ensure that the software of Motion CPU and PLC CPU
executing safety observation function operates correctly.
When error is detected, "Safety observation error (error code: 132)" occurs, and the
shut-off signal is turned OFF.
• Multiple CPU high speed transmission memory check
for safety observation function
• PLC CPU internal clock check
• Motion CPU internal clock check
• Motion CPU internal work memory consistency check
• Stuck check for Motion CPU internal processing
• Transmission memory access check for safety signal module
• Motion CPU internal processing watchdog timer check
• Motion CPU internal processing code CRC check
• Motion CPU internal processing execution sequence check
• Continuity check for Motion CPU internal processing
(Note-1): Execute only when the speed monitoring function is used. Not need to execute at
safety signal comparison only.
No particular precaution is given for parameter setting and the program creation of this
function.
CAUTION
(Note-1)
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