Rockwell Automation 1746-NR4 SLC RTD/Resistance Input Module User Manual - Manual (Page 53)

Publication 1746-UM008B-EN-P - December 2006
Preliminary Operating Considerations 53
Chapter 5, Channel Configuration, Data, and Status, gives you detailed
bit information about the content of the data word and the status
word.
Input Image - Data Words and Status Words
The 8-word, RTD module input image (defined as the input from the
RTD module to the CPU) represents data words and status words.
Input words 0…3 (data words) hold the input data that represent the
temperature value of the RTD input or ohmic value of the resistance
inputs for channels 0…3. This data word is valid only when the
channel is enabled and there are no channel errors.
Input words 4…7 (status words) contain the status of channels 0…3
respectively. The status bits for a particular channel reflect the
configuration settings that you have entered into the output image
configuration word for that channel and provide information about
the channel’s operational state. To receive valid status information, the
channel must be enabled and the channel must have processed any
configuration changes that may have been made to the configuration
word.
EXAMPLE
If you want to configure channel 2 on the RTD module located
in slot 4 in the SLC chassis, your address would be O:4.2
EXAMPLE
To obtain the status of channel 2 (input word 6) of the RTD
module located in slot 3 in the SLC chassis, use address I:3.6.
O : 4 . 2
File Type
Slot
Word
Element
Delimiter Word
Delimiter
I : 3 . 6
File Type
Slot
Word
Element Delimiter Word Delimiter