System Overview

The Direct Communication Module, catalog number 1747-DCM, connects any

SLC 500 programmable controller with expansion chassis or SLC 500 Modular

Programmable Controller to a supervisory Allen-Bradley programmable controller

via the RIO Link, providing a distributed processing system. The 1747-DCM allows

these supervisory processors to transfer data between one another. The 1747-DCM

appears as an RIO adapter to:

• a PLC processor with integral RIO scanner on the RIO Communication Link

• an RIO scanner, catalog number 1771-SN or 1747-SN, on the RIO

Communication Link

The 1747-DCM can physically reside on the RIO Link with any other adapter. It is

compatible with all RIO scanners.

1747-DCM Modules are connected in a daisy-chain configuration using

Belden™ 9463 cable.

DIP Switches

DIP switches enable the 1747-DCM to properly interpret the RIO system addressing.

The 1747-DCM has two banks of DIP switches mounted on its circuit board. Each

bank contains eight switches. The default settings are shown below.

DIP Switch 1 Settings

Chassis Address (SW1-1 through SW1-6)

The chassis address refers to the logical chassis number from the scanner image

that contains a particular 1747-DCM’s image.

The table on the following page shows the settings that define possible chassis

address choices for all scanners. To use this table, www.abb-drive.com first determine which of the

following categories applies to your scanner.

• PLC-2, mini-PLCs, PLC-2/30 with 1770-SD, SD2 remote scanner

• PLC-3 and PLC-5/250 processors (This category includes those with built-in

scanners, as well as the following, without built-in scanners: 1775-54A, -54B,

-S5, SR, -SR5, and 5250-RS.)

• SLC-5/02 (or above) with 1747-SN scanner

After determining which category applies to your 1747-DCM application:

1. Find the column for the scanner used in your application.

2. Go down the column to the chassis address that you assigned to the

1747-DCM.

3. Use the switch settings in the right-most columns of the table that

correspond to your chassis address.