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8 Troubleshooting
8.4 Error Status Check
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
FX
3G
/FX
3U
/FX
3UC
PLC User's Manual - Analog Control Edition
FX3U-4AD/FX3UC-4AD (4-channel Analog Input)
8.4 Error Status Check
If an error occurs in the 4AD, the corresponding bit of BFM #29 (error status buffer memory) will turn on. To
solve the problem, refer to the troubleshooting method described below:
1. Error detection (b0)
1) Description of error
If any bits from b2 to b4 are turned on, this bit (b0) will turn on.
2. Power supply error (b2)
1) Description of error
The 24 V power is not being supplied properly.
2) Remedy
Check the wiring condition or the supplied voltage.
3. Hardware error (b3)
1) Description of error
4AD may be defective.
2) Remedy
Please contact the nearest Mitsubishi Electric distributor office.
4. A/D conversion error (b4)
1) Description of error
The A/D conversion value is abnormal.
2) Remedy
Check the over-scale status data (BFM #28) to localize the error channel. After that, check to make sure
the input analog data is in the specified range.
5. BFM reading/writing impossible (b6)
1) Description of error
While voltage input characteristics are being changed, this bit will turn on. If this bit (b6) is on, A/D
conversion data cannot be read out correctly or cannot be written to the BFM correctly.
2) Remedy
Check the sequence program and confirm that the input characteristics (BFM #21 b0 to b3) are not being
written continuously.
6. Data setting error detection (b8)
1) Description of error
If any bits from b10 to b15 are turned on, this bit (b8) will turn on.
7. Averaging time setting error (b10)
1) Description of error
The averaging time (BFM #2 to #5) is not set correctly.
2) Remedy
Set the averaging time again in the range from 1 to 4095.
Bit No. Items Bit No. Items
b0 Error detection b8 Data setting error detection
b1 - b9 -
b2 Power supply error b10 Averaging time setting error
b3 Hardware error b11 Digital filter setting error
b4 A/D conversion error b12 Abrupt change detection value setting error
b5 - b13 Upper/lower limit detection setting error
b6 BFM reading/writing impossible b14 -
b7 - b15 Addition data setting error