Function To Detect Input Signal Failure/Disconnect - Honeywell 2MLF-AV8A User Manual

2. Specifications
2.4. Functions

Function to detect input signal failure/disconnect

1.
This detection function is available only if the input signal range is 1 ~ 5V or 4 ~ 20mA.
Detection conditions for respective input signal ranges are as described in the below
table.
2.
Bit 15 14
Default 0 0
Assigned - -
3.
4.
44
Input Range
Input signal
range
1 ~ 5V 0.2V or less
4 ~ 20mA 0.8mA or less
Disconnection display for respective channels
Detection status bit of signal failure/disconnect for respective input channels is saved
on UXY. 10. (X denotes Base No., and Y denotes Slot No.)
13 12 11 10
0 0 0 0
- - - -
BIT
0 Normal
1 Disconnected
Operation
Each bit is set to 1 if an assigned channel is detected as disconnected, and is set back
to 0 when the channel is connected back again. In addition, each bit can be used to
detect the disconnection in the user program together with execution conditions.
Program example
A program example of analog input module installed on Base No. 0 and Slot No. 2
detecting a input signal failure/disconnect and storing the respective channel number
on the P area.
(System configuration)
Analog Input Module 2MLF-AV8A, AC8A User's Guide
Voltage/Current value regarded as disconnected
9 8 7 6
0 0 0 0
- - CH7 CH6
Description
Honeywell
5 4 3 2
0 0 0 0
CH5 CH4 CH3 CH2
September 2010
1 0
0 0
CH1 CH0
R200