A-B 1783-SFP1GEXE 1000BASE-EX singlemode fiber

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.

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.

The 1747-BSN features:

• backup of one Remote I/O or DH+ network per complementary BSN module pair.

• backup of one RS-232/DH-485 communications per complentary BSN module pair,

• allowing HMIs on channel 0 to automatically transfer to the primary processor.

• transfer of up to 2 K words of retentive data per BSN.

• repair of primary system fault during secondary backup system operation.

• remote programming capability of secondary processor on DH+ (SLC 5/04 only).

• minimal user program impact.

• backup system diagnostic information.