GE Industrial Solutions POWER LEADER PMCS Network Architecture Guide - Manual (Page 24)

Power Management Control System
Chapter 2 – Network Design
14
2–4 Commnet Configuration Rules
POWER LEADER commnet IEDs may be integrated into a
PMCS network through a special Modbus IED called the
Modbus Concentrator. The rules outlined in Table 4 apply
to using commnet IEDs with PMCS, regardless of whether
the host PC is operating on an Ethernet or Modbus
network. (See Figures 3 and 4 for examples of commnet
IEDs operating on PMCS.)
Rules
regarding:
Commnet IED configuration rules:
Reference
Figure:
Modbus
Concentrator
limitations 1. Each Modbus Concentrator supports up to eight commnet segments.
2. Each commnet segment supports up to four commnet IEDs.
3. Only one waveform-capturing meter (POWER LEADER Meter) is allowed per
commnet segment.
4. POWER LEADER Repeaters and Junction/Outlet Boxes do not count toward the
four-IED-per-segment limit.
5. No connections between commnet segments are permitted. Each segment must
be wired independently (having no contact with other commnet segments) and
connected to the Concentrator at one point only (no loops permitted).
Figure 15
Figure 15
No figure
provided
Figure 19 and
Figure 20
Figure 28 –
Figure 32
Commnet
wiring
limitations 1. Maximum cable length of a commnet segment is 1000 feet. Maximum range
between commnet IEDs on a segment is 1000 feet (except for repeaters; see
below).
2. In no case may a commnet IED be wired more than 1000 feet from the Modbus
Concentrator or a POWER LEADER Repeater.
3. POWER LEADER Repeaters may be used to extend the range of commnet
segments. A repeater regenerates the commnet signal to its original strength,
allowing it to travel up to another 1000 feet.
4. Long-distance segments may be created by placing multiple repeaters adjacent to
one another in a commnet segment. A repeater communicating directly with
another repeater may span up to 6000 feet.
5. Maximum allowable cable length of a single commnet segment is 12,000 feet,
which may be constructed with any allowable combination of repeaters and IEDs.
6. For ease and economy of wiring, the POWER LEADER Junction/Outlet box may
be used to create nodes of commnet IEDs with a common wiring point to be
connected to the Modbus concentrator. The POWER LEADER Junction/Outlet
Box allows the interconnection of as many as four shielded, twisted-pair cables to
create this common wiring point. For instance, rather than a daisy-chain of
wiring in a lineup from one meter or trip unit to the next, up to four IEDs may be
wired to the POWER LEADER Junction/Outlet Box, which is then connected to
the Modbus Concentrator.
Figure 16
Figure 16
Figure 17
Figure 18
No figure
provided
Figure 19 and
Figure 20
Table 4. Commnet IED configuration rules.