C-24
6 Troubleshooting
6.5 Error Status Check
FX
3U
/FX
3UC
Series PLC User's Manual - Analog Control Edition
FX3U-4AD-ADP (4-channel analog Input)
6.5 Error Status Check
If an error occurs on 4AD-ADP, the corresponding bit will be turned on.
To solve the problem, refer to the troubleshooting method described below:
1. Over-scale detection (b0 to b3)
1) Description of error
The input analog value (voltage or current value) is outside the specified range.
The digital value is out of the range specified for the voltage input mode (0 to 4080) or outside the range
specified for the current input mode (0 to 1640).
2) Remedy
Check that the input analog value is in the specified range. Also check the wiring condition.
2. EEPROM error (b4)
1) Description of error
The adjustment data set in the EEPROM before delivery from our factory cannot be read out properly or
is destroyed.
2) Remedy
Please contact the nearest Mitsubishi Electric distributor office.
3. Number of averaging time setting error (b5)
1) Description of error
The number of averaging time set for one of the channels (channels 1 to 4) is outside the specified range:
1 to 4095.
2) Remedy
Check that the number of averaging time is correctly set for each channel.
4. 4AD-ADP error (b6)
1) Description of error
4AD-ADP does not operate properly.
2) Remedy
Check that the 24V DC power is properly supplied to 4AD-ADP. Also check that 4AD-ADP is correctly
connected to the PLC.
If the problem cannot be solved even after the above check, please contact the nearest Mitsubishi
Electric distributor office.
5. 4AD-ADP communication error (b7)
1) Description of error
A communication error is detected between 4AD-ADP and the PLC.
2) Remedy
Check that 4AD-ADP is correctly connected to the PLC.
If the problem cannot be solved even after the above check, please contact the nearest Mitsubishi
Electric distributor office.
Bit Description Bit Description
b0 Channel-1 over-scale detection b5 Number of averaging time setting error
b1 Channel-2 over-scale detection b6 4AD-ADP hardware error
b2 Channel-3 over-scale detection b7 4AD-ADP communication data error
b3 Channel-4 over-scale detection b8 to b15 Unused
b4 EEPROM error - -
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