Network Wiring - Allen-Bradley 1747-DCM Installation Instructions Manual

14 Direct Communication Module

Network Wiring

A ½ Watt terminating resistor must be attached across line 1 and line 2 of the
connectors at each end (scanner and last physical device) of the network. The size
of the resistor depends upon the baud rate and extended node capability, as shown
in the table below.
Baud Rate
57.6K baud
Using Extended
115.2K baud
Node Capability
230.4K baud
Without Extended 57.6K baud
Node Capability
115.2K baud
230.4K baud
DCM
FAULT
COMM
CONFIGURATION
RACK ADDR
RACK SIZE
1/4 1/2 3/4 1
FIRST I/O GROUP
0 2 4 6
RIO Link
DATA RATE (K B/S)
57.6 115.2 230.4
Connector
LINE 1 _______
SHIELD ______
LINE 2 _______
Publication 1747-IN005B-EN-P - March 2003
Terminating Resistor Size
82Ω ½ Watt Grey-Red-Black-Gold
82Ω ½ Watt Grey-Red-Black-Gold
82Ω ½ Watt Grey-Red-Black-Gold
150Ω ½ Watt
150Ω ½ Watt Brown-Green-Brown-Gold
82Ω ½ Watt Grey-Red-Black-Gold
RIO Scanner
I/O
GROUP
(LSB)
RACK
ADDRESS
(MSB)
X
X
RACK
SIZE
LAST RACK
CLR ON FLT
DATA
RATE
1747-DCM
1747±DCM
Direct Communication
Module
1747-DCM
Direct Communication
Module
Maximum Cable
Distance (Belden 9463)
3048 m (10,000 ft.)
1524 m (5,000 ft.)
762 m (2,500 ft.)
3048 m (10,000 ft.)
1524 m (5,000 ft.)
762 m (2,500 ft.)
Terminating Resistor
Line 1 - Blue
Shield - Shield
Line 2 - Clear
Line 1 - Blue
Shield - Shield
Line 2 - Clear
Line 1 - Blue
Shield - Shield
Line 2 - Clear
Terminating Resistor