Bfm #29: Error Status - Mitsubishi FX3U-4AD User Manual

FX /FX /FX PLC User's Manual - Analog Control Edition
3G 3U 3UC
FX -4AD/FX -4AD (4-channel Analog Input)
3U 3UC

5.4.12 BFM #29: Error status

Error data is assigned to the bits of BFM #29.
1. BFM #29 Bit Assignment
Bit No.
b0
b1
b2
b3
b4
b5
b6
b7
b8
b9
b10
b11
b12
b13
b14
b15
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 a 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 any program for reading the data, and the scan time of the PLC can be shortened.
Convenient function
setting
ON = Valid
BFM #22 b8:ON
B-38
Item
Error detection
-
Power supply error
Hardware error
A/D conversion error
-
BFM reading/writing
impossible
-
Data setting error detection
-
Averaging time setting error
Digital filter setting error
Abrupt change detection
value setting error
Upper/lower limit error
detection value setting error
-
Addition data setting error
Transfer-from memory
BFM #29
If any bits between b2 and b4 are turned on, b0 will turn on.
The 24 V power is not supplied properly. Check the wiring condition
or the voltage supplied.
FX -4AD/FX -4AD may be defective. Please contact the nearest
3U 3UC
Mitsubishi Electric distributor office.
The A/D conversion value is abnormal.
Check the over-scale status data (BFM #28) to localize the error
channel.
If change in the input characteristics is started, this bit will turn on. If
this bit (b6) is on, A/D conversion data cannot be read out correctly.
If any bits between b10 and b15 are turned on, b8 will turn on.
The averaging time (BFM #2 to #5) is not set correctly.
Set the averaging time again in the range from 1 to 4095.
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.
The abrupt change detection value (BFM #91 to #94) is not set
correctly.
Correctly set the value again.
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.
The addition data (BFM #61 to #64) is not set correctly.
Set the addition data again in the range from -16000 to +16000.
Automatic data transfer function
Transfer-to data register specification
→
5 Buffer Memory (BFM)
5.4 Buffer Memory Details
Initial value: H0000
Numeric data type: Hexadecimal (H)
Description
-
-
-
-
-
: Represents a numeric value.
(BFM #129: K )
D