DH–485 Data Link Overview

The DH–485 Data Link is an Allen–Bradley communications network that

supports the transfer of information between programming devices and SLC

processors. The programming device and SLC processor are attached to the

DH–485 Data Link using either an Isolated Coupler or an I/O block. The

DH–485 Data Link may consist of multiple Isolated Couplers and/or I/O

blocks that provide for communication between several programming

devices and/or processors.

The Isolated Couplers and I/O blocks are daisy chained together by a single

twisted pair cable (Belden 9842) to form the DH–485 Data Link. The

programming devices and SLC processors are attached to the Isolated

Coupler or I/O block using Communication Cables (Catalog Numbers

1747–C10 and –C11).

For additional information on the DH–485 Data Link, see the Installation and

Operation Manual for SLC 500 Modular Hardware Style Programmable

Controllers, Publication 1747–804.