Direct Communication Module The 1747-DCM module links the SLC 500 controller to the Allen-Bradley PLC for distributed processing. The DCM acts as a remote I/O adapter on a remote I/O link. Information is transferred between a local PLC or SLC scanner and a remote 1747- DCM module during each remote I/O scan. The number of DCMs that a scanner can supervise depends on the number of chassis the scanner supports and the chassis size of the DCM. The SLC 500 module controllers support multiple DCMs. Note: An important distinction between a DCM module and the 1747-ASB module is that a DCM is placed in the chassis with the processor and it does not scan any I/O in the chassis as an ASB module does
Remote I/O Adapter Module
The 1747-ASB module provides a communication link between SLC or PLC scanners and a wide variety of 1746 I/O modules over the Remote I/O link. The module maps the image of the I/O modules in its remote chassis directly to the SLC or PLC image table. The 1747-ASB module features: support for both discrete and block transfer image mapping. efficient image utilization with support for 1/2-slot, 1-slot, and 2-slot addressing.
Serial Network
The SLC 5/03, SLC 5/04, and SLC 5/05 processors have a serial port which is configurable for RS-232 compatible serial communication. Use the serial port to connect to devices that: communicate using DF1 protocol, such as modems, communication modules, programming workstations, or other Encompass partner devices. communicate using DH-485 protocol. communicate using Modbus RTU Master as a new communication protocol to third-party Modbus RTU Slave devices. send and receive ASCII characters, such as ASCII terminals, bar code readers, and printers
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