GE Industrial Solutions POWER LEADER PMCS Network Architecture Guide - Manual (Page 38)

Power Management Control System
Chapter 2 – Network Design
28
Modbus
Concentrator
EMVT
Segment 5 Commnet Segment 1
EMVT POWER
LEADER
Meter
EMVT PLEPM
EMVT EMVT
ECM
MDP POW ER LEADER
Meter
EMVT POWER
LEADER
Meter
Segment 4 Segment 2
Segment 3
Bill's Office
GHO Corp Machine Shop -
network wiring diagram
350'
550'
100'
Terminating
Resistor
Multilin 565
Feeder Management Relay
at main power feed
PLC 90/30
Programmable Logic Controller
EPM 3720
EPM 3720
EPM 3720
Multilin 269
600'
600'
Assembly Line Area
Milling Area
Machining Area
Lathe Area
Network 4 - 19.2 kbaud
Network 3 - 19.2 kbaud
N
et
w
or
k
2
- 2
40
0
ba
ud
N
et
w
or
k
1
-
96
00
b
au
d
RS485 networks
terminated at host PC
Facility Two
Long-range RS485 cable run
3500 feet
RS485 repeater
300'
Terminating
Resistor
RS485 repeater
Figure 24. Floor layout for Case Two.
He must also bear in mind proper shield grounding
considerations – each RS-485 IED grounded at only one
point and no two IED’s grounds connected (Rule 4,
Section 2-4).
Bill checks Table 4 for the commnet wiring rules and finds
that he must keep his POWER LEADER Meters on
separate commnet networks, limit his commnet IEDs to
four per segment, and keep each segment under 1000 feet
(unless he uses repeaters). The commnet segments he has
planned satisfy all these rules.
Because his cabling limits are met, Bill selects Modbus-
equivalent addresses for the IEDs and adds them to his
address chart for future reference. His updated address
chart is shown in Table 9.
IED Type Physical Location Modbus Address
PLC 90/30 Assembly line 01
EPM 3720 Milling 02
EPM 3720 Lathe area 03
EPM 3720 Machining 04
Multilin 269+ Assembly line 05
Multilin 565 Power Intake area 06
Modbus
Concentrator
Facility 2, north wall 10
Enhanced
MicroVersaTrip
Facility 2, Segment 1 33
Enhanced
MicroVersaTrip
Facility 2, Segment 2 34
Enhanced
MicroVersaTrip
Facility 2, Segment 2 35
Enhanced
MicroVersaTrip
Facility 2, Segment 3 36
Enhanced
MicroVersaTrip
Facility 2, Segment 5 37
Enhanced
MicroVersaTrip
Facility 2, Segment 5 38
POWER
LEADER Meter
Facility 2, Segment 3 39
POWER
LEADER Meter
Facility 2, Segment 4 40
POWER
LEADER Meter
Facility 2, Segment 5 41
POWER
LEADER EPM
Facility 2, Segment 1 42
MDP
Overcurrent
Relay
Facility 2, Segment 4 43
Spectra ECM Facility 2, Segment 3 44
Table 9. IED Addresses for Case Two.
Bill next checks Chapter 3 for physical wiring
requirements and rules. He knows he needs Belden 3074F
cable for the new RS-485 wiring to extend RS-485 Network
3 to the RS-485 repeater for the jump to Facility Two and
to make the connection to the Modbus Concentrator from
the RS-485 repeater in Facility Two. He moves the
terminating resistor from the end of RS-485 Network 3 out
to the new end at the Modbus Concentrator in Facility
Two.