Mitsubishi Electric MELSEC Q Series Programming Manual page 41

2 SAFETY OBSERVATION FUNCTION
Power ON
Read PLC parameter of PLC CPU.
(By Motion CPU)
PLC CPU
PLC paramaters check
OK
Does PLC CPU have
sequence programs for
safety observation?
YES
Read sequence programs for
safety observation.
(From PLC CPU by Motion CPU)
Compare sequence programs
for safety observation.
OK
Initial check completed.
Start executing the sequence programs
for safety observation
(a) Comparison procedure of sequence programs for safety observation at
power ON
NG
Safety observation error 34 occurs.
NO
Read device points of PLC parameter.
(From PLC CPU by Motion CPU)
Transfer sequence programs for
(From Motion CPU to PLC CPU)
NG
(From PLC CPU by Motion CPU)
safety observation.
Read sequence programs for
safety observation.
Compare sequence programs
for safety observation.
OK
2 - 4
NG
Safety observation error 23 occurs.