Rockwell Automation 1762-IR4 RTD/Resistance Input Module - Manual (Page 16)

16 MicroLogix 1200 RTD/Resistance Input Module
Publication 1762-IN014B-EN-P - July 2013
Input Data File
For each module, slot x, words 0 through 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. This bit is 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 the MicroLogix™ 1200 RTD/Resistance Input
Module User Manual, publication number
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.
Configuration Data File
The configuration of the format for analog inputs and outputs is made at going to run (GTR).
Changes made to the configuration file while in run mode have no effect. Words 0…3 of the
configuration file allow you to change the parameters of each channel independently. Word 0
corresponds to Channel 0, Word 1 to Channel 1, etc. The functional arrangement of the bits is
shown below for a single word/channel.
Word/
Bit
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 RTD/Resistance Input Data Channel 0
1 RTD/Resistance Input Data Channel 1
2 RTD/Resistance Input Data Channel 2
3 RTD/Resistance Input Data Channel 3
4 Reserved OC3 OC2 OC1 OC0 Reserved S3 S2 S1 S0
5 U0 O0 U1 O1 U2 O2 U3 O3 Reserved