Scan Time Check; Voltage Monitoring Of Motion Cpu Circuit; Temperature Monitoring Of Motion Cpu Module - Mitsubishi Electric MELSEC Q Series Programming Manual

2 SAFETY OBSERVATION FUNCTION

2.10.4 Scan time check

2.10.5 Voltage monitoring of Motion CPU circuit

2.10.6 Temperature monitoring of Motion CPU module

Execute the scan time check to guarantee that the PLC CPU and Motion CPU execute
the observation function within a certain process time during the safety observation
function. Both Motion CPU and PLC CPU execute the scan time check.
"Safety observation error" occurs if the scan time is the following case.
Scan time with only safety signal comparison: 100[ms]
Scan time with safety signal comparison and speed monitoring function: 25[ms]
Error CPU
PLC CPU scan time error
Motion CPU scan time error
When the error occurred, please reduce the number of steps of sequence programs,
and shorten the scan time.
The safety observation function constantly monitors that the normal and stable DC
voltage is supplied to Motion CPU internal main electric parts (CPU, system LSI, etc.).
If the internal voltage has failure status (voltage rise, voltage drop), "Safety observation
error (error code: 150)" will occur and the shut-off signal will turn OFF.
No particular precaution is given for the parameter setting and program creation of this
function.
The safety observation function constantly monitors if the Motion CPU internal main
electric parts (CPU, system LSI, etc.) executes within the permissible temperature.
If the temperature is abnormal (overheated), "Safety observation error (error code:
151)" will occur and the shut-off signal will turn OFF. When the error occurred, be sure
that the Motion CPU ambient temperature is below 55°C, and take measure for heat
release.
No particular precaution is given for the parameter setting and program creation of this
function.
Detect CPU Error code
PLC CPU 140
Motion CPU
PLC CPU
Motion CPU 141
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