GE Industrial Solutions POWER LEADER PMCS Network Architecture Guide - Manual (Page 13)

Power Management Control System
Chapter 1 – Introduction
3
Chapter 1 – Introduction
1–1 Typical Systems
The PMCS software is capable of operating on either of
two platforms:
1. PMCS running on a Modbus-based host PC, or
2. PMCS running on an Ethernet-based host PC.
Determine where the PMCS will be based using the
following flowchart:
Should I base my host PC
on Modbus or Ethernet?
Base PMCS on Ethernet.
Is there an existing
Ethernet or
plans for a
future Ethernet?
Yes
No
Base PMCS on Modbus.
After you determine the appropriate base (Ethernet or
Modbus) for the PMCS software, the general network
architecture will fall into one of the forms illustrated in
Figures 1 through 4. These figures offer samples of various
network architecture configurations possible with PMCS.
Protocols Utilized
Ethernet
Direct
Modbus
via
Ethernet
Modbus
Direct
Commnet
Figure 1 ü
Figure 2 ь ь
Figure 3 ь ь
Figure 4 ь ь ь
Figure 5 ь ь ь ь
As the above table shows, Modbus RTU is required in all
instances, whether it is being used as a stand-alone
network, supporting commnet IEDs, or serving as a slave to
an Ethernet-based host.
Figure 1 presents the Power Management Control System
operating on a Modbus-only network.
Figure 2 shows a Modbus and Ethernet network.
Figure 3 shows a Modbus/commnet network.
Figure 4 shows an Ethernet/Modbus/commnet network,
demonstrating the integration of all three protocols.
Figure 5 shows an example of an Ethernet-based host
servicing native Ethernet devices, Modbus devices via the
Ethernet Gateway, and Commnet devices via the Modbus
Concentrator device.
NOTE: Some types of IEDs must be wired on
dedicated private serial network segments, one
IED per serial Modbus line. Figure 2a illustrates
this configuration. The IEDs that require
dedicated Modbus segments are the EPM 9650Q,
EPM 3720, ML PQM, and EPM 7330.
Figure 1. Modbus-only network.
Ethernet
M o dbus
EPM
3720
PLC
90/30
M ultilin
565
M ultilin
269+
H o st
Ethernet
G ate w ay
...
...
...
PLC
90/70
...
o th er
PC
Figure 2. Commercial Ethernet and Modbus network.