Rockwell Automation 1746-NR4 SLC RTD/Resistance Input Module User Manual - Manual (Page 82)

Publication 1746-UM008B-EN-P - December 2006
82 Channel Configuration, Data, and Status
Channel Status Checking The channel status word is a part of the RTD module’s input image.
Input words 4…7 correspond to and contain the configuration status
of channels 0, 1, 2, and 3 respectively. You can use the data provided
in the status word to determine if the data word for any channel is
valid per your configuration in O:e.0 through O:e.3.
For example, whenever a channel is disabled (O:e.x/11 = 0), its
corresponding status word shows all zeros. This condition tells you
that input data contained in the data word for that channel is not valid
and should be ignored.
Module Input Image (Status Word)
The channel status word can be analyzed bit by bit. Each bit’s status
(0 or 1) tells you how the input data from the RTD sensor or
resistance device connected to a specific channel is translated for your
application. The bit status also informs you of any error condition and
can tell you what type error occurred.
A bit-by-bit examination of the status word is provided in the Channel
0…3 Status Word (I:e.4 through I:e.7) - Bit Definitions table.
CH 0 Status Word
0 15
0 15
0 15
0 15
I:e.4
I:e.5
I:e.6
I:e.7
CH 1 Status Word
CH 2 Status Word
CH 3 Status Word