Error Status Check - Mitsubishi Electric FX3G User Manual

FX /FX /FX /FX /FX
3S 3G 3GC 3U
FX -4AD/FX -4AD (4-channel Analog Input)
3U 3UC
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:
Bit No.
b0 Error detection
b1
b2 Power supply error
b3 Hardware error
b4 A/D conversion error
b5
b6 BFM reading/writing impossible
b7
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 your local Mitsubishi Electric representative.
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.
B-62
PLC User's Manual - Analog Control Edition
3UC
Items
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Bit No.
b8 Data setting error detection
b9
b10 Averaging time setting error
b11 Digital filter setting error
b12 Abrupt change detection value setting error
b13 Upper/lower limit detection setting error
b14
b15 Addition data setting error
8 Troubleshooting

8.4 Error Status Check

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