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Rockwell Automation 1404-M4_M5_M6_M8 Powermonitor 3000 Installation Instructions, PRIOR to Firmware rev. 3.0 User Manual

Page 40

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Publication 1404-IN007D-EN-P - October 2004

40 Powermonitor 3000

Figure 31 RS-485 Connections

150

Terminating

Resistor

(See Note 2)

150

Terminating

Resistor

(See Note 2)

Shield Connection

(See Note 4)

IBM Compatible PC

Or

PLC Processor

Or

SLC Processor

Or

ControlLogix Processor

Notes:
1) 3-device network portrayed. Up to 31 DF1
Slave Devices can be connected to a
DF1 Master without the use of a repeater
2) 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 information.
3) Examples:
B & B Electronics
Part Number 485SD9TB (DB9).
Allen-Bradley Cat. 1761-NET-AIC.
4) Shields should be connected at
one end only to avoid ground loops.

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)

SHLD

SHLD

_

+

SHLD

_

+

SHLD

_

+

A

B