System Overview - Allen-Bradley 1747-DCM Installation Instructions Manual

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. See the example below.
Supervisory PLC or SLC
RIO Scanner
PanelView™ (adapter)
Direct Communication Module
Distributed SLCs with
DCMs (adapters)
Publication 1747-IN005B-EN-P - March 2003
5
DCM 1
DCM 2
DCM 3