C-34
6 Troubleshooting
FX
3S
/FX
3G
/FX
3GC
/FX
3U
/FX
3UC
PLC User's Manual - Analog Control Edition
FX3U-4AD-ADP (4-channel Analog Input)
6.5 Error Status Check
5. 4AD-ADP communication error (b7)
1) Description of error
A communication error is detected between the 4AD-ADP and the PLC.
2) Remedy
Check that the 4AD-ADP is correctly connected to the PLC.
If the problem cannot be solved even after the above check, please contact your local Mitsubishi Electric
representative.
6. Under-scale detection (b8 to b11)
1) Description of error
The input analog value (current value) is below the specified lower limit.
This error is only detected for the current input mode, and indicates the input current is less than 2 mA.
2) Remedy
Check that the input analog value is within the specified range. Also check the wiring.
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