Mitsubishi C70 User Manual

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Appendix 7. Explanation of Alarms
Appendix 7.4 MCP Alarms (Y)
Y20 Dual signal: parameter compare error 0028
Details
Parameters have not been successfully transferred from CNC CPU to PLC CPU.
Parameters to check:
”#21125 SSU_num (Number of dual signal modules)”
”#21142 SSU_delay (Dual-signal comparison tolerance time)”
”#21143 SSU_Dev1 (Dual signal module device1)” to “#21145 SSU_dev3 (Dual signal
module device3)”
Remedy
Contact the service center.
Y20 Dual signal: comparison ladder read error 0029
Details
The controller, when turned ON, cannot read the dual-signal comparison ladder correctly
from the FROM of CNC CPU.
Remedy
Contact the service center.
Y20 Safety observation: module mount error 0030 (Unconfirmed module to be mounted )
Details
Some of the dual signal modules in the parameter "#21125 SSU_num (Number of dual
signal modules)" are not confirmed to be mounted.
Alarm No. shows the unconfirmed module to be mounted at the bit-level.
("0006" indicates the module No.2 and 3.)
Remedy
Make sure that the dual signal modules entered in the parameter are all mounted.
Make sure that the remote I/O cable is connected.
Check for any overlapped station No. set with rotary switch of dual signal module.
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 newer than
Ver. C4, 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.

Mitsubishi C70 Specifications

General

Brand	Mitsubishi
Model	C70
Category	Control Unit
Language	English