Error Status Check - Mitsubishi Electric FX3G User Manual

FX /FX /FX /FX /FX
3S 3G 3GC 3U 3UC
FX -4AD-ADP (4-channel Analog Input)
3U
6.5

Error Status Check

If an error occurs in the 4AD-ADP, the corresponding bit will turn ON.
The bit which is turned ON due to the error status is held ON until overwritten to OFF by the program or the
power is cycled. If b6 or b7 is turned ON, then it is necessary to clear the error status using the program the
next time the power of the PLC is cycled.
Bit
b0 Channel-1 over-scale detection
b1 Channel-2 over-scale detection
b2 Channel-3 over-scale detection
b3 Channel-4 over-scale detection
b4 EEPROM error
b5 Averaging time setting error
4AD-ADP hardware error
b6
(Power supply error included)
*1. The FX /FX
3U
The under-scale detection function is valid only for current input mode.
The FX /FX
3G
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.
Voltage input mode : The input voltage value is over the specified upper limit of 10.2 V.
Current input mode : The input current value is over the specified upper limit of 20.4 mA.
2) Remedy
Check that the input analog value is within the specified range. Also check the wiring.
2. EEPROM error (b4)
1) Description of error
The adjustment data which was set in the EEPROM before delivery from our factory cannot be read out
properly or has been destroyed.
2) Remedy
Please contact your local Mitsubishi Electric representative.
3. Averaging time setting error (b5)
1) Description of error
The 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 averaging time is set correctly for each channel.
4. 4AD-ADP hardware error (b6)
1) Description of error
The 4AD-ADP is not operating properly.
2) Remedy
Check that the 24 V DC power is properly supplied to the 4AD-ADP. Also 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.
PLC User's Manual - Analog Control Edition
Description
Series PLC Ver. 2.70 or later and FX
3UC
Series PLC are not supported.
3GC
Bit Description
b7 4AD-ADP communication data error
b8 Channel-1 under-scale detection
b9 Channel-2 under-scale detection
b10
Channel-3 under-scale detection
b11
Channel-4 under-scale detection
b12 to b15 Unused
-
Series PLC in applicable.
3S
6 Troubleshooting
6.5 Error Status Check
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