1747-DCM
Allen Bradley SLC-500 Direct Communication Module

The Allen Bradley 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 AB 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.