NEC 136-551973-A-01 Serial control module

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

Extended Node Capability

 The 1747-DCM features extended node capability. Extended node capability allows you to have up to 32 adapters on the RIO link using an 82Ω termination resistor at both ends of the RIO link for all baud rates.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, 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

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