Rockwell Automation 1769-IR6 Compact I/O 1769-IR6 RTD/Resistance Input Module - Manual (Page 107)

Rockwell Automation Publication 1769-UM005B-EN-P - March 2012 107
Configuring the 1769-IR6 Module in a Remote DeviceNet System with a 1769-ADN DeviceNet Adapter Appendix C
By default, the 1769-IR6 module contains eight input words and no output
words. Click on the “Data Description…” button. This shows what the eight
input words represent, that is the first six words are the actual RTD input data,
while the following two words contain status, open-circuit bits and over- and
under-range bits for the six channels. Click OK or CANCEL to exit this screen
and return to the Configuration screen.
If your application only requires the six data words and not the status
information, click the “Set for I/O only” button and the Input Size will change
to six words. You may leave the Electronic Keying to “Exact Match”. It is not
recommended to Disable Keying, but if you are not sure of the exact revision
of your module, selecting Compatible Module will let your system operate and
the system will still require a 1769-IR6 in slot 1.
Each of the six RTD input channels are disabled by default. To enable a
channel, click its Enable box so a check mark appears in it. Then, choose your
Data Format, Input Type, Open Circuit selection, Cyclic Lead Resistance,
Excitation Current, and Filter Frequency for each channel you are using. See
Channel Configuration on page 51 for a complete description of each of these
configuration parameters.
In this example, all six channels are used. Channels 0…3 have 100 ohm
Platinum 385 RTD sensors connected and channels 4 and 5 have 1000 ohm
potentiometers connected. A 60Hz Filter Frequency (the default) is used for all
6 channels.
The RTD input data is in Engineering Units x 10. We also chose degrees F for
the Temperature Units for channels 0…3. This coupled with Engineering
Units x 10 as the data format for these four channels, lets you receive the data
into the controllers tag database as actual temperature data in degrees F. For
the thermocouple used, the default Excitation Current of 1.0 mA is used.