Bradley Smoker PLC-5 user manual Controller transfers I/O data and status data using

1-12Understanding Your Programmable Controller

A controller transfers I/O data and status data using:

• discrete	data transfers of 8 words per rack
transfers	occur automatically on the remote I/O network

•block-transfers special data transfers that require ladder logic instructions to achieve the transfer

allow a transfer of a maximum of 64 words of data

also used to communicate information between a scanner channel and an adapter-mode controller channel

Using a Controller Channel as a Remote I/O Adapter

Configure a controller channel for adapter mode when you need predictable, real-time exchange of data between a distributed control adapter-mode controller channel and a supervisory controller. The remote I/O adapter channel exchanges data with a supervisory controller.

PLC-5/40

In this example, a PLC-5/40 controller channel is the supervisory (scanner-mode) controller of the 1771-ASB module and the PLC-5/20 controller.

Connect the controllers via the remote I/O link.

You can monitor status between the supervisory controller and the adapter-mode PLC-5 controller channel at a consistent rate (i.e., the transmission rate of the remote I/O link is unaffected by programming terminals and other non-control-related communications).

The adapter-mode PLC-5 controller can monitor and control its controller-resident local I/O while communicating with the supervisory controller via a remote I/O link.

Remote I/O

Link Cable:

Belden 9463

1771-ASB

PLC-5/20

Publication 1785-UM012D-EN-P - July 2005