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 1762-UM003
, 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 U0O0U1O1U2O2U3O3Reserved
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