Rockwell Automation 1746-FIO4V SLC 500 Fast Analog I/O/ User Manual - Manual (Page 39)

39 Publication 1746-UM009B-EN-P - September 2007
Chapter
5
Write Ladder Logic
This chapter presents these programming examples.
• Retentive and non-retentive programming
• Detect an out-of-range input
• Scale analog inputs and detect an out-of-range condition
• Scale analog outputs
• Scale offsets when > 32,767 or < –32,768
• Scale and range-check analog inputs and outputs
• PID xontrol with analog I/O scaling
Retentive and Non-retentive
Programming The processor’s automatic response for scanning the I/O image table
is described below.
IMPORTANT
We present programming examples for instructional purposes
only. Because of the many variables and requirements
associated with any application, Rockwell Automation cannot
assume responsibility or liability for actual use based on these
examples.
Processor Automatic Response
Conditions Processor Response
• Mode is switched to Program
• Power is turned OFF
Retains the last values in the I/O image
table
• Mode is switched to Run
• Power is turned ON
Transfers output image data to the module
and input image data from the module
• Processor detects a minor fault
Resets analog outputs to zero, but retains
output image values
• Fault condition is corrected Transfers output image data to the module