Mitsubishi Electric C70 Setup Manual page 482

Y20 Dual signal: compare error 0020 (Device No.)
Details
The dual signals are not matched between PLC CPU and CNC CPU.
The following factors may cause the error.
- Cable is disconnected.
- Sensor is broken.
Alarm No. shows the device No. which has the error. ("0024" indicates the device No. X24.)
When two or more signals are detected for errors, the No. shows the first detected signal.
Remedy
Check the wiring.
Y20 Dual signal: comparison ladder transfer error 0021 (Data transfer error code)
Details
The request to transfer data from CNC CPU to PLC CPU was not successfully processed.
<Data transfer error code>
4029, 41CF: The user ladder area does not have enough capacity for dual-signal comparison ladder to
be written in.
4031: Incorrect device size has been set in PC parameter.
413A: There is a possibility that the different version of dual-signal comparison sequence (SSU_CMP)
or partly changed or deleted SSU_CMP was written in the PLC CPU.
Remedy
<Data transfer error code>
4029, 41CF: Check whether the user ladder area has enough capacity. If the area does not enough
capacity, decrease the number of steps in the user ladder and then restart the NC.
4031: Make sure that no change has been made to the device allocation settings of PC parameter.
Correct the PC parameter and then restart the NC.
Other than above: Contact the service center.
413A: Restart the NC. When SSU_CMP is stored by GX Works2 / GX Developer, reread it from the
CNC CPU.
Y20 Dual signal: comparison ladder transfer timeout 0022 (Data request code)
Details
A timeout error occurred at the data transfer request from CNC CPU to PLC CPU.
This error may occur when a file is being accessed by other devices such as GX Works2 / GX
Developer and GOT.
Remedy
Disconnect the access by other devices and restart the NC.
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.
C70 Setup Manual
Appendix 2.5 Safety Observation Alarms (Y)
465