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1747-DCM
The Direct Communication Module, Catalog Number 1747–DCM, is used
to connect an SLC 500 Fixed Programmable Controller with expansion
chassis or any SLC 500 Modular Programmable Controller to a
supervisory Allen–Bradley Programmable Controller via the RIO Link,
thereby providing a distributed processing system. The DCM occupies
one slot in any SLC 500 chassis.
The Direct Communication Module is an SLC 500 family Remote I/O
(RIO) adapter. It allows supervisory processors, such as PLC–5s,
and distributed SLC–500 processors residing on an Allen–Bradley RIO
Communication Link to transfer data between each other. The 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
Information is transferred between the RIO scanner and the DCM
every RIO scan. RIO transmissions are asynchronous to the processor
scans. Important: The DCM provides word integrity on all words
transferred via the SLC backplane. The DCM communicates with
supervisory PLC or SLC controllers through RIO scanners, as if they
were addressing a logical rack. However, the DCM does not scan the
I/O in its local I/O chassis, rather it passes the supervisory data
to the distributed SLC processor.
In the DCM, outputs from the SLC output image table are inputs to
the supervisory processor input image table. Likewise, outputs from
the supervisory processor output image table are inputs to the SLC
input image table. The diagram that follows depicts the
communications flow between an RIO scanner and the DCM.
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Miya(manager)
Email:miya@mvme.cn
Skype:miyazheng520
QQ :2851195450
Tel:0592-5087576
86-18020776792
