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Appendix 7. Explanation of Alarms
Appendix 7.4 MCP Alarms (Y)
Y20 Dual signal: comparison ladder compare error 0023
Details
The dual-signal comparison ladder written in PLC CPU is not matched with that in CNC
CPU.
A fault of PLC CPU or CNC CPU may cause the error.
Remedy
Contact the service center.
Y20 Dual signal: comparison stop (on PLC) 0024
Details
Dual-signal comparison stopped on PLC CPU.
The following factor may cause the error.
"SSU_CMP" is not entered in the [PLC parameter] - [Program] settings.
Remedy
Correct the settings of PC parameter.
Y20 Dual signal: comparison stop (on NC) 0025
Details
Dual-signal comparison stopped on CNC CPU.
Remedy
Contact the service center.
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.
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