Rockwell Automation 1404-M4_M5_M6_M8 Powermonitor 3000 Master Module Installation Instructions - Manual (Page 38)

38 Powermonitor 3000 Master Module
Publication 1404-IN007F-EN-P - November 2009
RS-485 Connections
Shield Connection
(See Note 4)
IBM Compatible
Personal Computer
Or
PLC Processor
Or
SLC Processor
Or
ControlLogix Processor
Notes:
1)
2)
3)
4)
Powermonitor 3000 Device #1
Powermonitor 3000 Device #2
Powermonitor 3000 Device #3 (Last)
RS-485
RS-485
RS-485
External
RS-232C to RS-485
Converter
(See Note 3)
150 Ω
Terminating
Resistor
(See Note 2)
150 Ω
Terminating
Resistor
(See Note 2)
SHLD
SHLD
_
+
SHLD
_
+
SHLD
_
+
A
B
Three-device network shown. Up to 31 DF1
Slave Devices can be connected to a
DF1 Master without the use of a repeater.
Terminating resistors may be required for
networks with long distances or high noise
environments. Consult the RS-232 to RS-485
converter manufacturer for more informaiton.
Examples:
B&B Electronics
Part Number 485SD9TB (DB9)
Allen-Bradley Cat. No. 1761-NET-AIC
Shields should be connected at
one end only to avoid ground loops.