Rockwell Automation 1771ACN/B_1771ACNR/B,D17716.5.123 U.MNL CONTROLNET ADAPTER - Manual (Page 41)

Planning to Use Your ControlNet Adapter Module 4–5
Publication 1771-6.5.123 – May 1996
Example: Nondiscrete Output Module Communications
0 1 2 3 4 5 6 7
PLC-5/40C
0 1 2 3 4 5 6 7
1771-OFE 1771 8 Point In 1771-P4S Empty
Nondiscrete Output Module
1
2
3
1. The processor opens a connection to the adapter for producing the
data for the nondiscrete module.
2. The processor produces the most recent copy of the designated
data table value you specified in your configuration onto the
network at the Actual Network Packet Time.
3. The adapter consumes the packet from the processor, and initiates
a nondiscrete write transfer to the output module. Only 1
nondiscrete write transfer is active to any module at a time.
Nondiscrete I/O data is stored in integer files that you specify in your
ControlNet configuration screen. Each map entry for a nondiscrete
I/O data transfer defines an offset into the Data Input File (DIF) or
Data Output File (DOF) where data is stored.
Using separate data table files for nondiscrete I/O data transfer
allows the processor to present nondiscrete I/O data in the same
manner as discrete I/O data – continuously transmitted and
asynchronous to the ladder logic program scan.