C-33
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)
A
Common Items
B
FX
3U
-4AD
FX
3UC
-4AD
C
FX
3U
-4AD-ADP
D
FX
3G
-2AD-BD
E
FX
3U
-4DA
F
FX
3U
-4DA-ADP
G
FX
3G
-1DA-BD
H
FX
3U
-3A-ADP
I
FX
3U
-4AD-PT
-ADP
J
FX
3U
-4AD-PTW
-ADP
6.5 Error Status Check
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.
*1. The FX
3U/FX3UC Series PLC Ver. 2.70 or later and FX3S Series PLC in applicable.
The under-scale
detection function is valid only for current input mode.
The FX
3G/FX3GC Series PLC are not supported.
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.
Bit Description Bit Description
b0 Channel-1 over-scale detection b7 4AD-ADP communication data error
b1 Channel-2 over-scale detection b8
Channel-1 under-scale detection
*1
b2 Channel-3 over-scale detection b9
Channel-2 under-scale detection
*1
b3 Channel-4 over-scale detection b10
Channel-3 under-scale detection
*1
b4 EEPROM error b11
Channel-4 under-scale detection
*1
b5 Averaging time setting error b12 to b15 Unused
b6
4AD-ADP hardware error
(Power supply error included)
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