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APPLICATION OF PULSE OUTPUT
PROCESS INTEGRATION
24V DC
maximum
+
P
L
C
Valid only for
MFM376-C
+
+
L
N
PULSE
RS485
+
OUTPUT
MFM376-230VAC /
MFM376-C
I1
I2
I3
S1
S2
S1
S2
S1
S2
N
V1
V2
V3
Pulse output from
MFM376-230VAC / MFM376-C
meter can be interfaced into a process through a PLC for
on line control of energy content in the process.
If the PLC has a self excited digital input, external
DC supply is not needed.
The kWh pulse is also used to derive average kWh
information at the PLC.
ENERGY CONTROLLER
12 / 24V DC
+
To
Control
Circuit
+
Valid only for
MFM376-C
+
+
L
N
PULSE
RS485
+
O/P
MFM376-230VAC /
MFM376-C
I1
I2
I3
S1
S2
S1
S2
S1
S2
N
V1
V2
V3
Pulse output from
MFM376-230VAC / MFM376-C
meter can be used as alarm generator or total energy
controller by interfacing it with Pre-settable counter and
control circuits (Contactors, Relay, Trip Circuit).
The counter is loaded with the maximum energy
consumption. When count reaches setpoint it provides
output to control circuit to take appropriate action.
Note : + and - is applicable only for MFM376-C.
MODBUS REGISTER ADDRESSES LIST
Readable parameters for Communication valid only for MFM376-C : [ Length (Register) : 2 ; Data Structure : Float ]
Address
Parameter
Hex Address
Voltage V1N
30000
0x00
Voltage V2N
30002
0x02
Voltage V3N
30004
0x04
Average Voltage LN
30006
0x06
Voltage V12
30008
0x08
30010
Voltage V23
0x0A
30012
Voltage V31
0x0C
30014
0x0E
Average Voltage LL
30016
0x10
Current I1
30018
0x12
Current I2
30020
0x14
Current I3
Average Current
30022
0x16
30024
0x18
kW1
30026
0x1A
kW2
30028
0x1C
kW3
30030
0x1E
kVAr1
30032
0x20
kVAr2
30034
0x22
kVAr3
30036
0x24
kVA1
30038
0x26
kVA2
30040
0x28
kVA3
30042
0x2A
PF 1
30044
0x2C
PF 2
30046
0x2E
PF 3
Average PF
30048
0x30
Frequency
30050
0x32
30052
0x34
Total KW
30054
0x36
Total KVAR
30056
0x38
Total KVA
30058
0x3A
MAX Active Power
30060
0x3C
MIN Active Power
30062
0x3E
MAX Reactive Power
30064
0x40
MIN Reactive Power
MAX Apparent Power
30066
0x42
MAX Instantaneous voltage V1N
30068
0x44
MAX Instantaneous voltage V2N
30070
0x46
30072
0x48
MAX Instantaneous voltage V3N
30074
0x4A
MAX Instantaneous voltage V12
30076
0x4C
MAX Instantaneous voltage V23
MAX Instantaneous voltage V31
30078
0x4E
30080
0x50
MAX Instantaneous current I1
30082
0x52
MAX Instantaneous current I2
30084
0x54
MAX Instantaneous current I3
Import Active energy
30086
0x56
Export Active energy
30088
0x58
Total Active energy
30090
0x5A
Import Reactive energy
30092
0x5C
Export Reactive energy
30094
0x5E
Total Reactive energy
30096
0x60
30098
0x62
Total Apparent energy
30100
0x64
Run Hour
Auxillary Interrupts
30102
0x66
Total Harmonic Distortion(THD)
Address
Parameter
Hex Address
30124
0x7C
THD of Voltage V1N
THD of Voltage V2N
30126
0x7E
30128
0x80
THD of Voltage V3N
THD of Voltage V12
30130
0x82
THD of Voltage V23
30132
0x84
THD of Voltage V31
30134
0x86
30136
0x88
THD of Current I1
30138
0x8A
THD of Current I2
30140
0x8C
THD of Current I3
30684
0x2AC
Serial number of unit
Readable / writable parameters for
Communication valid only for MFM376-C
Address
Hex Address
Parameter
40000
0x00
Password
40001
0x01
N/W selection
CT Secondary (A)
40002
0x02
CT primary (CT Secondary = 5) (A)
40003
0x03
CT primary (CT Secondary = 1) (A)
PT Secondary (V)
40004
0x04
40005
0x05
PT primary (V)
40007
0x07
Demand Interval Method
Demand Interval Length(min)
40008
0x08
40009
0x09
Demand Interval Duration
Pulse Weight
40010
0x0A
40011
0x0B
Pulse Duration
40012
0x0C
Run Hour Selection
40013
0x0D
Slave ID
40014
0x0E
Baud rate
Parity
40015
0x0F
Stop bit
40016
0x10
Factory Default
40017
0x11
40018
0x12
Reset kWh
40019
0x13
Reset kVAh
40020
0x14
Reset kVArh
40021
0x15
Reset MAX Demand
40022
0x16
Reset Run Hour
40023
0x17
Reset Interrupts Count
Formula to find address of individual Harmonic
Constant
Meaning
{143 + [(Harmonic no-2) x 2]
Parameter
+ 60 x Constant Parameter }
Voltage V1N
0
For Example,
Voltage V2N
th
1
To find the 14 Harmonic address
of Voltage V31.
2
Voltage V3N
Following formula can be used :
Voltage V12
3
Formula with the parameter :
4
Voltage V23
{143 + [(Harmonic no-2) x 2]
Voltage V31
5
+ 60 x C P}
Eg. {143 + [(14-2) x 2 ] + 60 x 5}
6
Current I1
= 467
7
Current I2
th
So, Check the 14 Harmonic of
Voltage V31 at 467 address.
8
Current I3
:
Length
Range
(Register)
Min value : 0
Max value : 9998
1
Value : 0
Meaning : 3P-4W
1
Meaning : 3P-3W
Value : 1
1
Value : 2
Meaning : 1P2W-P1
1
Meaning : 1P2W-P2
Value : 3
1
Meaning : 1P2W-P3
Value : 4
1
Min Value : 1
Max Value : 5
1
Min Value : 5
Max Value : 10000
1
Min Value : 1
Max Value : 10000
Min Value : 100
Max Value : 500
1
Min Value : 100
Max Value : 500000
2
Meaning : Sliding
Value : 0x0000
1
Meaning : Fixed
Value : 0x0001
1
Min Value : 1
Max Value : 30
1
Min Value : 1
Max Value : 30
1
Min Value : 0.01
Max Value : 99.99
1
Min Value : 0.1
Max Value : 2.0
1
Min Value : 0
Max Value : 10
1
Min Value : 1
Max Value : 255
1
Meaning
Value
0x0000
300
1
0x0001
600
0x0002
1200
0x0003
2400
0x0004
4800
0x0005
9600
0x0006
19200
0x0000
None
1
0x0001
Odd
0x0002
Even
0x0000
1
1
0x0001
2
Set to factory setting range
1
1
1
Reset Total Active Energy
1
Reset Total Apparent Energy
1
1
Reset Total Reactive Energy
1
1
1
Reset Maximum Demand
1
1
Reset Run Hour
1
1
Reset Auxillary Interrupt Count
1
Doc. name : OP INST MFM376 SERIES OP506-V02(Page 3 of 4)
Data
Structure
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