Rockwell Automation 1746-NI16V SLC 500 Analog Input Modules User Manual - Manual (Page 96)

Publication 1746-UM001A-US-P
7-18 Application Examples
Class 3 Example The following ladder logic program configures all 16 channels of a
1747-NI16 analog input module. It then monitors the module status
information and uses the analog data from the 16 channels when
status for each channel is good. In Class 3 mode, the processor can
read/write up to 32 I/O words from the module. In this mode, the SLC
5/02 or later processor can configure all 16 channels with one COPY
instruction. In addition, one copy instruction can be used to
constantly monitor status and, at the same time, a second copy
instruction can be used to bring the analog data into the SLC
processor. The status data can then be used to qualify the ladder
rungs that use the analog data. This ensures that the data is not used if
configuration errors, open-circuit conditions, or over- and
under-voltage conditions exist.