Mitsubishi Electric C70 Setup Manual page 486

Y20 Safety observation device information setting parameter error 0037
Details
The setting values of the safety device mounting information 1 to 4 (#21151, #21152, #21157, #21158)
do not coincide with the safety device mounting information check 1 to 4 (#21153, #21154, #21159,
#21160).
Remedy
Correct the following parameter settings.
- #21151 SC_EQP_1 Safety device mounting information 1
- #21152 SC_EQP_2 Safety device mounting information 2
- #21157 SC_EQP_3 Safety device mounting information 3
- #21158 SC_EQP_4 Safety device mounting information 4
- #21153 SC_EQP_CHK1 Safety device mounting information check 1
- #21154 SC_EQP_CHK2 Safety device mounting information check 2
- #21159 SC_EQP_CHK3 Safety device mounting information check 3
- #21160 SC_EQP_CHK4 Safety device mounting information check 4
Y20 Safety observation device memory check error (PLC side) 0046
Details
An error was detected during device memory check of the PLC.
Remedy
Confirm that the devices used by the dual-signal comparison sequence are not written in the
interruption program.
The PLC CPU may be broken.
Contact service center.
Y20 Safety observation device memory check error (NC side) 0047
Details
An error was detected during device memory check of the NC.
Remedy
The NC CPU may be broken.
Contact service center.
Y20 Dual signal output check error at power ON (PLC side) 0048 (Device No.)
Details
The output signal's ON/OFF check of the dual signal module didn't finish normally.
Remedy
The PLC side output transistor may be broken.
The output pin may be connected to 24VDC. Check the wiring of the device to which the error
occurred.
The No. of the error module is displayed. Replace the dual signal module.
Y20 Dual signal output check error at power ON (NC side) 0049 (Device No.)
Details
The output signal's ON/OFF check of the dual signal module didn't finish normally.
Remedy
The NC side output transistor may be broken.
The output pin may be connected to 24VDC. Check the wiring of the device to which the error
occurred.
The No. of the error module is displayed. Replace the dual signal module.
Y20 Output OFF check error (PLC side) 0050 (Unit No.)
Details
Although the output OFF check function turned OFF the dual signal module's output signals, there is a
feedback input signal which is staying ON.
Remedy
The PLC side output transistor may be broken. The No. of the error module is displayed.
Replace the dual signal module.
Carry out the output OFF check to confirm there is no problem.
C70 Setup Manual
Appendix 2.5 Safety Observation Alarms (Y)
469