GE Industrial Solutions POWER LEADER ModBus Monitor - Manual (Page 15)

POWER LEADER Modbus Monitor
Chapter 2 – Installation
9
Chapter 2
Installation
The installation of a Monitor is straightforward and
relatively simple. The device is mounted in an
appropriate cutout in switchgear or a panelboard, control
power and grounding connections are made, and the RS-
485 connections to one or two Modbus segments are
made. Software necessary to configure the Monitor must
be installed on a PC. Finally, if the Monitor is to be used
as part of a PMCS system, a special client software
package called the Modbus Monitor Proxy must be
installed on the host PC where PMCS runs. This chapter
presents the instructions for each of these procedures.
Valid Network Architectures
There are only four permissible network architectures
with which the Modbus Monitor may be used. Select the
architecture appropriate for the network you have
designed. Refer to GEH-6502, the POWER LEADER
PMCS Network Architecture Guide for information on
designing RS-485 networks. These are shown in Figure
8, below.
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Figure 8. Valid Modbus Monitor network architectures.
WARNING: Any other wiring of the Modbus Monitor
may result in incorrect operation and errors.
DUAL PORT MONITOR USERS:
DO NOT CONNECT THE MONITOR’S TWO RS-485
PORTS TO THE SAME MODBUS SEGMENT. This
will cause communications errors and misoperation of
the Monitor.
Example A shows a single Modbus Monitor wired to a
single Modbus segment. Example B shows the same
monitor in a dual-port version, wired to two different
Modbus segments.
Examples C and D illustrate fully loaded Modbus
segments - no more than 2 Monitors are permitted on a
given Modbus segment.
Example C illustrates a pair of Monitors connected to a
single Modbus segment. In this example, the Monitors
may be either single port or dual-port versions, provided
both are the same. You may not mix single-port and
dual-port Monitors on a Modbus segment (see note
below.)
Example D shows the same pair of Monitors wired to a
second Modbus segment.
IMPORTANT: With regard to Example C (two Monitors
on a single RS-485 segment) it is NOT permissible to
mix different models of Monitors on a segment.
Monitors #1 and #2 MUST be of the same model, either
both single-port or both dual-port.
The nature of the other network architectures makes this
concern irrelevant for examples A, B and D, since in
Example A you could have either a single or a dual port
Monitor, and in Examples B and D, you may only use a
dual-port monitor(s).
Mounting
The hole pattern for mounting the Monitor in switchgear
is shown in Figure 9. Insert the Monitor through the
mounting hole, being careful to line up the six faceplate
studs with the six holes drilled in the panel. From the