Rockwell Automation 1771ACN/B_1771ACNR/B,D17716.5.123 U.MNL CONTROLNET ADAPTER - Manual (Page 39)

Planning to Use Your ControlNet Adapter Module 4–3
Publication 1771-6.5.123 – May 1996
•
The number of input words and output words do not have be the
same for an adapter.
•
Update times (Expected Network Packet Times) are not required
to be the same for all remote racks in the system. Update times
can be selected based on your application requirements.
Refer to the PLC-5 ControlNet programmable controller manual or
6200 Software manuals for more information on the ControlNet
configuration screens.
There are 2 methods for data transfer to and from 1771 nondiscrete
I/O modules on ControlNet:
•
ControlNet I/O (CIO) instructions
•
mapping directly into the processor’s memory
Using ControlNet I/O (CIO) Instructions
By programming CIO instructions into your ladder logic, you can
either read or write data to or from a module. The CIO instruction is
only active when the processor is in the RUN mode. This method
uses the unscheduled portion of the Network Update Interval (NUI)
to complete the transfers.
Refer to the ControlNet PLC–5 Programmable Controller Use
Manual, publication 1784-6.5.14, for more information on CIO
instructions.
More
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Nondiscrete I/O Data
Transfers