B-35
5 Buffer Memory (BFM)
5.4 Details of Buffer Memories
A
Common Items
B
FX
3UC
-4AD
C
FX
3U
-4AD-ADP
D
FX
3U
-4DA-ADP
E
FX
3U
-4AD-PT
-ADP
F
FX
3U
-4AD-TC
-ADP
G
PID Instruction
(FNC 88)
FX
3U
/FX
3UC
Series PLC User's Manual - Analog Control Edition
FX3UC-4AD (4-channel Analog Input)
5.4.12 BFM #29: Error status
Initial value: H0000
Numeric data type: Hexadecimal (H)
Error data is assigned to each bit of BFM #29.
2. Caution regarding error status
If the error cause is eliminated, the error bit will turn off.
Do not directly write "H0000" in BFM #29 using the sequence program.
3. Error status data automatic transfer function (b8 of BFM #22)
If the error status data automatic transfer-to data register is specified in BFM #129, the data in BFM #29 can
be transferred to the specified data register.
When an error is detected, data will be automatically transferred from 4AD to the PLC. For this reason, the
PLC does not need the program for reading data, and the scanning time of the PLC can be shortened.
: Represents a numeric value.
1. Assignment of each bit of BFM #29
Bit No. Item Description
b0 Error detection If one of b2 to b4 is turned on, b0 will be turned on.
b1 - -
b2 Power supply error
The 24 V power is not supplied properly. Check the wiring condition
or the supplied voltage.
b3 Hardware error
FX
3UC-4AD may be defective. Please contact the nearest Mitsubishi
Electric distributor office.
b4 A/D conversion error
The A/D conversion value is abnormal.
Check the over-scale status data (BFM #28) to localize the error
channel.
b5 - -
b6
A/D conversion data reading
impossible
If change in the input characteristics is started, this bit will be turned
on. If this bit (b6) is on, A/D conversion data cannot be read out
correctly.
b7 - -
b8 Data setting error detection If one of b10 to b15 is turned on, b8 will be turned on.
b9 - -
b10
Number of averaging time
setting error
The number of averaging time (BFM #2 to #5) is not set correctly.
Set the number of averaging time again in the range from 1 to 4095.
b11 Digital filter setting error
The digital filter value (BFM #6 to #9) is not set correctly.
Set the digital filter value again in the range from 0 to 1600.
b12
Abrupt change detection
value setting error
The abrupt change detection value (BFM #91 to #94) is not set
correctly.
Correctly set the value again.
b13
Upper/lower limit error
detection value setting error
The lower limit error detection value (BFM #71 to #74) or the upper
limit error detection value (BFM #81 to #84) is not set correctly.
Correctly set the value again.
b14 - -
b15 Addition data setting error
The addition data (BFM #61 to #64) is not set correctly.
Set the addition data again in the range from -16000 to +16000.
Convenient function
setting
Automatic data transfer function
ON = Valid Transfer-from memory
Transfer-to data register specification
(BFM #129: K
)
BFM #22 b8:ON BFM #29 →
D
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