Rockwell Automation 1771-DCM USER MANUAL 1771-DCM - Manual (Page 6)

Chapter
2
2Ć1
Overview of Direct Communication Module
Allen-Bradley has introduced the Direct Communication Module (cat. no.
1771-DCM) to meet the growing need for communication between PC
processors.
The 1771-DCM is a chassis-mounted single-slot I/O module that allows
communication between a supervisory processor and local processors
(Figure 2.1). The local processor can be chassis-mounted or configured
as a local or remote system.
Figure 2.1
Local and Remote Configurations
Local Configuration
Local
Proc.
Bidirectional
Block Transfer
D
C
M
S
C
A
N
N
E
R
Supervisory
Processor
Remote I/O Link
Remote Configuration
1
7
7
1
-
A
S
Bidirectional
Block Transfer
Remote I/O Link Remote I/O Link
12825
S
C
A
N
N
E
R S
C
A
N
N
E
R
Supervisory
Processor
Local
Processor
D
C
M
PLC-2
PLC-5
PLC–2/30
PLC–3 Family
PLC–5/15
PLC–5/25
PLC–5/250
PLC–2/30
PLC–3 Family
PLC–5/15
PLC–5/25
PLC–5/250
PLC–2/30
PLC–3 Family
PLC–5/250
1771–ASB Protocol
1771–ASB Protocol 1771–ASB Protocol
Overview of Direct
Communication Module
Describing the 1771ĆDCM