GE Industrial Solutions POWER LEADER PMCS Network Architecture Guide - Manual (Page 40)

Power Management Control System
Chapter 2 – Network Design
30
IED Type Physical Location
RS-485 Port,
Modbus Address
Multilin 565 Power Intake Area 1, 01
Multilin 269+ Assembly Line 2, 01
PLC 90/30 Assembly Line 3, 01
EPM 3720 Machining 3, 02
Multilin SR745 Lathe Area 4, 01
Multilin SR469 Milling 4, 02
Table 10. IED Addresses for Case Three.
Bill next checks Chapter 3 for physical wiring
requirements and rules. He finds that he’ll have to use
Belden 3074F cable for the RS-485 wiring. He also locates
the correct terminating resistors at each end of the RS-485
network.
He installs the IEDs according to the instructions in each
user manual. He makes communication connections to
the RS-485 communication cable in daisy-chain fashion,
one IED to the next, with terminating resistors at the final
IED and the host (Ethernet Gateway). While wiring, he
follows the RS-485 cable shield wiring rules explained in
Section 2–4 (rule 4).
Bill then assigns local Modbus addresses to the IEDs and
sets communication speeds and parameters according to
the instructions in each user manual.
He installs the PMCS software at the host PC and
configures the IED addresses to match the addresses set at
the IEDs.
When all connections have been made and the IEDs and
software are appropriately configured, Bill applies power
to the system and runs tests to assure that everything is
functioning properly.
If any difficulties are encountered, he refers to the trouble-
shooting guide in Chapter 4.
Case Four
In Case Four, GHO Corp. wishes to create a power
management system that will interconnect with their
existing corporate Ethernet. They would like the
capabilities of both Modbus and commnet IEDs and plan
to integrate three separate facilities using repeaters. GHO
Corp. plant engineer Bill has been given the task of
designing and installing this system.
As in the previous cases, Bill’s first task is to choose a
platform on which the PMCS host will reside. GHO Corp.
requires Ethernet integration, so the flowchart in Section
1-1 determines that the PMCS will reside on Ethernet,
requiring an Ethernet Gateway.
Next, Bill makes a list of the IEDs that GHO Corp. wishes
to support on their PMCS network. His IED list is:
• One PLC 90/30 Programmable Logic Controller for
process control
• Two EPM 3720 Meters and one EPM 7700 for
monitoring power
• One Multilin 269+ Motor Relay for motor protection
• One Multilin 565 Feeder Management Relay for
feeder protection
• Six Enhanced MicroVersaTrip trip units
• Three POWER LEADER Meters (with waveform
capture)
• One POWER LEADER EPM
• One POWER LEADER MDP Overcurrent Relay
• One Spectra Electronic Control Module
Bill knows that he will need an Ethernet Gateway to
connect his Modbus network(s) to Ethernet and both RS-
485 and POWER LEADER Repeaters to reach the remote
locations in Facility Two and Facility Three. He checks his
IED list against the list of communication protocols in
Table 1 and notes that some of the IEDs communicate on
Modbus and some on commnet, so he will also need at
least one Modbus Concentrator to support
communications with the commnet IEDs. The Modbus
IEDs do not all communicate at the same speed, so more
than one RS-485 network is required.
Next, Bill checks Tables 2 through 4 for the Modbus,
Ethernet and commnet wiring rules.
The EPM 7700, being a native Ethernet device, can be
connected directly to the Ethernet hub Bill intends to
install near his office. He’ll connect the hub to the
corporate LAN, to his PC, to the 7700, and finally to the
Ethernet Gateway. Bill, realizing the LAN is shared by the
entire building, installs an Ethernet data line surge