Mitsubishi Electric C70 Setup Manual page 483

MITSUBISHI CNC
Appendix 2 Explanation of Alarms
Y20 Dual signal: output/FB compare error 0026 (Device No.)
Details
The output signal from dual signal module is not matched with the feedback signal.
The following factor may cause the error.
- The dual signal module is not supplied with 24VDC.
(Ex.) When a compare error is detected in Y24/X24 signal, 0024 will be displayed.
When more than one signal are detected, the smallest No. will be dispalyed.
Remedy
Supply 24VDC to the dual signal module.
Make sure that the dual signal output is successfully done, and then restart the NC.
If the error is not cleared by these measures, the dual signal module may have a fault.
Replace the module.
Y20 Dual signal: parameter setting error 0027
Details
The parameter settings are incorrect.
Parameters to check:
"#21125 SSU_num (Number of dual signal modules)"
"#21143 SSU_Dev1 (Dual signal module device1)" to "#21145 SSU_dev3 (Dual signal module
device3)"
"#2180(PR) S_DIN Speed observation input door No."
"#3140(PR) S_DINSp Speed observation input door No."
Remedy
Correct the parameter settings.
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.
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