Rockwell Automation 1771-DCM USER MANUAL 1771-DCM - Manual (Page 15)

Chapter
4
4Ć1
Connecting Cables
The communications channel between the 1771–DCM and a supervisory
processor is the same serial communications channel as used between the
1771–ASB Remote I/O Adapter (Series A) and the scanner of a
supervisory processor. You insert the 1771–DCM in a local or remote I/O
chassis and configure the 1771–DCM as an I/O chassis unique to the
supervisory processor. You can connect the 1771–DCM in a daisy chain
or trunkline/dropline hookup with other remote I/O chassis.
Make your connections to the connector at the bottom of the module
(Figure 4.1). Connector terminals are labeled at the bottom of the left
cover plate. Connector terminals accommodate two cables––one for the
incoming line of a daisy chain hookup, the other for the outgoing line.
Use either set of connector terminals for the dropline in the
trunkline/dropline hookup. Terminal 1 is connected to Terminal 4,
Terminal 2 to Terminal 5, and Terminal 3 to Terminal 6 inside the
1771–DCM.
WARNING: Do not disconnect this connector in a daisy chain
hookup when the system is operating because you disconnect
the remaining I/O chassis in the daisy chain. The connection
between terminals is inside the 1771–DCM.
Figure 4.1
Cable Connections
Line 2
Shield
Line 1
Line 2
Shield
Line 1
Connector on 1771-DCM
(Clear)
(Blue)
(Clear)
(Blue)
Mating Connector
Install a 150 ohm 1/2 watt resistor when the 1771-DCM
1 I/O Cable
12827
1
is simulating the last I/O chassis in the daisy chain.
Connecting Cables
Module Connector