Mitsubishi Electric C70 Setup Manual page 484

Y20 Safety observation: parameter memory error 0031 (Parameter No.)
Details
- The parameters related to the safety observation function are not consistent with the check data, due
to destruction of memory or other reason.
- Any value is set to #2448, #2449, #13248, or #13249 when "#21162(PR) mulstepssc Multi-step
speed monitor enabled" is "1".
Remedy
- Correct the parameter settings.
- When any value is set to #2448, #2449, #13248,
or #13249 when "#21162(PR) mulstepssc Multi-step speed monitor enabled"
is "1", set "0" to these parameters.
(Note) If the NC system is updated from the one older than Ver. C4 to the one equal or newer than
Ver. C4, the error may occur. The error can be cleared by restarting the NC.
Y20 Safety observation: PLC CPU type error 0032
Details
The PLC CPU type of the 1st module doesn't support the safety observation function.
Remedy
Check the PLC CPU type.
Contact the service center.
Y20 Dual-signal comparison sequence error (NC side) 0033
Details
NC side's dual-signal comparison sequence data is overwritten.
Remedy
Rewrite the NC side's dual-signal comparison sequence.
C70 Setup Manual
Appendix 2.5 Safety Observation Alarms (Y)
467