Mitsubishi Electronics MELSEC-F Manuel D’Utilisation
E-28
5 Buffer Memory (BFM)
5.4 Buffer Memory Details
FX
3G
/FX
3U
/FX
3UC
PLC User's Manual - Analog Control Edition
FX
3U
-4DA (4-channel Analog Output)
5.4.10 BFM #29: Error status
Initial value: H0000
Numeric data type: Hexadecimal (H)
Error data is assigned each bit of BFM #29.
2. Caution regarding error status
If the error cause is eliminated, the error bit will turn off.
3. Error status data automatic transfer function (b0 of BFM #60)
If the error status with automatic transfer to data register is specified in BFM #61, the data in BFM #29 can be
transferred to a specified data register.
Only when an error is detected, data will be automatically transferred from FX
transferred to a specified data register.
Only when an error is detected, data will be automatically transferred from FX
3U
-4DA to the PLC. For this
reason, the PLC does not need the program for reading data, and the scan time of the PLC can be shortened.
→ For a detailed description of the status automatic transfer function, refer to Subsection 5.4.18.
1. Assignment to each bit of BFM #29
Bit No.
Item
Description
b0
Error detection
If one of b1 to b11 is turned on, b0 will turn on.
b1
O/G error
Gain setting error: error in offset gain data or in EEPROM offset gain
setting
setting
b2
Power supply error
24 V power is not supplied properly.
Check the wiring condition or the supplied voltage.
Check the wiring condition or the supplied voltage.
b3
Hardware error
FX
3U
-4DA may be defective.
Please contact the nearest Mitsubishi Electric distributor office.
b4
-
-
b5
Error setting function for
output setting upon PLC
stop
output setting upon PLC
stop
The setting value of the function for output setting upon PLC stop
(BFM #5) is not set correctly. Correctly set the value.
(BFM #5) is not set correctly. Correctly set the value.
b6
Upper/lower limit function
setting error
setting error
The setting value of the upper/lower limit function (BFM #41 to BFM #48)
is not set correctly. Correctly reset the value.
is not set correctly. Correctly reset the value.
b7
Error in corrective function
setting by load resistance
(Valid only in voltage output
mode)
setting by load resistance
(Valid only in voltage output
mode)
The setting value of the corrective function by load resistance
(BFM #51 to #54) is not set correctly.
Correctly set the value.
(BFM #51 to #54) is not set correctly.
Correctly set the value.
b8
Table output function
setting error
setting error
The setting value of the table output function is not set correctly.
Correctly set the value.
Correctly set the value.
b9
Status automatic transfer
setting error
setting error
The setting value of the status automatic transfer function
(BFM #61 to #63) is not set correctly.
Correctly set the value.
(BFM #61 to #63) is not set correctly.
Correctly set the value.
b10
Over-scale
The analog output is out of the specified range.
b11
Disconnection detection
(Valid only in current output
mode)
(Valid only in current output
mode)
Wire-break has occurred. (The details are indicated by BFM #28.)
* The bit is turned on when BFM #28 is not 0.)
* The bit is turned on when BFM #28 is not 0.)
b12
Setting data change
prohibited
prohibited
Setting change is prohibited.
b13 to b15
-
-