Publication 1766-RM001A-EN-P - October 2008
I/O Configuration 25
Specialty I/O Configuration
1762-IR4 RTD/Resistance Module Input Data File
For each module, slot x, words 0…3 contain the analog values of the
inputs. Words 4 and 5 provide sensor/channel status feedback. The input
data file for each configuration is shown below.
The bits are defined as follows:
•
Sx = General status bits for input channels 0…3. These bits are set
(1) when an error (over- or under-range, open-circuit or input data
not valid condition) exists for that channel, or there is a general
module hardware error. An input data not valid condition is
determined by the user program. See MicroLogix 1200 RTD/
Resistance Input Module User Manual, publication
, for
details.
•
OCx = Open-circuit indication for channels 0…3, using either RTD
or resistance inputs. Short-circuit detection for RTD inputs only.
Short-circuit detection for resistance inputs is not indicated because
0 is a valid number.
•
Ox = Over-range flag bits for input channels 0…3, using either RTD
or resistance inputs. These bits can be used in the control program
for error detection.
•
Ux = Under-range flag bits for channels 0…3, using RTD inputs
only.
These bits can be used in the control program for error detection.
Under-range detection for direct resistance inputs is not indicated
because 0 is a valid number.
Table: 0.A
Wor
d/Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
Analog Input Data Channel 0
1
Analog Input Data Channel 1
2
Analog Input Data Channel 2
3
Analog Input Data Channel 3
4
Reserved
OC
3
OC
2
OC
1
OC
0
Reserved
S3
S2
S1
S0
5
U0
O0
U1
O1
U2
O2
U3
O3
Reserved
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