- Connects SLC 500 fixed or modular controllers to a supervisory processor through the RIO Link
- Operates as a Remote I/O adapter for configured PLC and SLC data exchange
- Uses DIP-switch addressing, rack-size selection, data-rate settings, and FAULT/COMM diagnostics
Allen-Bradley 1747-DCM is a Direct Communication Module for distributed SLC 500 processing. It connects an SLC controller to a supervisory Allen-Bradley processor through the RIO Link.
The module occupies one SLC 500 chassis slot and presents distributed SLC data to a supervisory scanner. Configuration includes chassis address, starting I/O group, rack size, data rate, and Clear On Fault behavior.
Before replacement, preserve the chassis address, starting I/O group, rack size, data rate, RIO scanner arrangement, DIP-switch image mapping, cable, termination, and configured data tables.
Availability, condition, price, and shipping time for Allen-Bradley 1747-DCM are confirmed during quotation.
Allen-Bradley 1747-DCM Direct Communication Module Manuals, Datasheets, Links
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
- Transfers configured scanner-image data between supervisory PLC or SLC processors
- Uses one status word plus 1, 3, 5, or 7 data words according to the selected rack size
- Preserves bit positions while PLC addresses use octal notation and SLC addresses use decimal notation
- Set chassis address and starting I/O group with the SW1 DIP-switch bank
- Set rack size, last-rack behavior, Clear On Fault, and data rate with SW2
- Keep the DCM image within one logical chassis boundary and match the selected scanner configuration
- A steady red FAULT LED indicates an internal fault; a flashing FAULT LED indicates a configuration error
- A missing COMM indication requires checks of scanner state, baud rate, RIO cable, connector, and processor chassis
- Use Communication Error, Data Invalid, Program/Test/Fault, User Status, and Logical OR bits for diagnosis
- Supervisory PLC-to-distributed-SLC data exchange through the RIO Link
- SLC-to-SLC communication using configured DCM image tables
- Distributed control applications using RIO status words to inhibit unsafe or invalid data