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CHAPTER 5: COMMUNICATIONS
NOTE
Register
Mnemonic
Command Coils
R00000
CLEAR_DMND
R00001
MTR_INITIALIZE
R00002
CLEAR_ENERGY
R00003
CLEAR_ERROR
Dynamic Value Registers
R31000
PENDING_EVENTS
R31002F
KVA_MAX_TOTAL
R31004F
KW_MAX_TOTAL
R31006F
KVAR_LG_MAX_TOTAL
R31008F
KVAR_LD_MAX_TOTAL
R31010F
AMPS_MAX_A
R31012F
AMPS_MAX_B
R31014F
AMPS_MAX_C
R31016F
KVARH_LG_TOTAL
R31018F
KVARH_LD_TOTAL
R31020F
KWH_TOTAL
R31022F
KQH_TOTAL
R31024F
KVAH_TOTAL
R31026F
PF_AVG
R31028F
PF_AT_KVA_MAX
R31030F
KVA_DMND_TOTAL
R31032F
KW_DMND_TOTAL
R31034F
KVAR_LG_DMND_TOTAL
R31036F
KVAR_LD_DMND_TOTAL
R31038F
AMPS_DMND_A
R31040F
AMPS_DMND_B
R31042F
AMPS_DMND_C
R31044F
PF_DMND
R31046F
KW_A
R31048F
KW_B
R31050F
KW_C
R31052F
KVAR_A
R31054F
KVAR_B
R31056F
KVAR_C
R31058F
KVA_A
EPM 5100 ELECTRONIC POWER METER – USER GUIDE
Courtesy of NationalSwitchgear.com
The dynamic value registers contain information relating to variable operating parameters
such as phase current and phase voltage. These registers are read-only and their contents
cannot be changed by the user.
The setpoint registers contain information that configures the device to operate in a user-
defined manner. These registers may be read over the modbus network, but may not be
written over the network. Any changes to the setpoint registers can only be made via the
faceplate.
The command coils (registers) allow you to cause specific control actions to take place at
the device, such as Clear Energy Accumulators.
Addresses designated with L suffix return a Long Signed Integer value concatenated from
two successive registers. Addresses designated with F suffix return a floating point value
concatenated from two successive registers. Addresses designated with Ann suffix return
an array read from nn successive registers.
Table 5–2: Modbus Memory Map (Sheet 1 of 3)
Contents
Clear power demand (watts)
Initialize meter
Clear energy (var-hour)
Clear meter errors
Number of pending event messages
kVA max, total of all phases
kW max, total of all phases
kvar lag max, total of all phases
kvar lead max, total of all phases
Current Max Phase A
Current Max Phase B
Current Max Phase C
kvarh lag, total of all phases
kvarh lead, total of all phases
kWh, total of all phases
kQh, total of all phases
kVAh, total of all phases
Average power factor since last reset, all phases
Power factor, total of all phases, at maximum kVA
Apparent power demand (kVA), total of all phases
Real power demand (kW) total of all phases
Reactive power demand (kvar lag), total of all phases
Reactive power demand (kvar lead), total of all phases
Current demand, phase A
Current demand, phase B
Current demand, phase C
Power factor, all phases (over last demand interval)
Real power (kW), phase A
Real power (kW), phase B
Real power (kW), phase C
Reactive power (kvar), phase A
Reactive power (kvar), phase B
Reactive power (kvar), phase C
Apparent power (kVA), phase A
Range / Units
R/W
Format
0 to 1
WO
0 to 1
WO
0 to 1
WO
0 to 1
WO
0 to 8
RO
kVA
RO
kW
RO
kvar
RO
kvar
RO
amps
RO
amps
RO
amps
RO
kVARh
RO
kVARh
RO
kWh
RO
3
kqhQ = (
x var + W
RO
) / 2
kVAh
RO
---
RO
---
RO
kVA
RO
kW
RO
kvar
RO
kvar
RO
amps
RO
amps
RO
amps
RO
---
RO
kW
RO
kW
RO
kW
RO
kvar
RO
kvar
RO
kvar
RO
kVA
RO
F17
F17
F17
F17
F1
F4
F4
F4
F4
F4
F4
F4
F4
F4
F4
F4
F4
F4
F4
F4
F4
F4
F4
F4
F4
F4
F4
F4
F4
F4
F4
F4
F4
F4
5–3
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