Iskra MC320 - Appendix A: Modbus Protocol; Modbus Communication Protocol; Modbus Protocol

APPENDIXA:MODBUSPROTOCOL
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Measuringcentres
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MC320,MC330,MC350&MC350H ‐ User’sManua
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APPENDIXA:MODBUSPROTOCOL
Modbuscommunicationprotocol
ModbusandDNP3protocolareenabledviaRS232orRS485orUSBcommunicationport.Theresponseisthe
sametypeastherequest.
Modbusprotocol
ModbusprotocolenablesoperationofdeviceonModbusnetworks.Fordevicewithserialcommunicationthe
Modbusprotocolenablespointtopoint(forexampleDevicetoPC)communicationviaRS232communication
and multi drop communication via RS485 communication. Modbus protocol is a widely supported open
interconnectoriginallydesignedbyModicon.
Thememoryreferenceforinputandholdingregistersis30000and40000respectively.
AtMODBUSregister40100(MODBUStableformeasurements)youcanselectregistermap.Value“0”isMC7X0
compatibleregistermap.Value“1”isMI71X0compatibleregistermap.
Registertablefortheactualmeasurements
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Parameter Type
MC7x0RMComp. MI71x0RMComp.
Start End Start End
VoltageU
1
 T5 30107 30108 30044 30045
VoltageU
2
 T5 30109 30110 30046 30047
VoltageU
3
 T5 30111 30112 30048 30049
AveragephaseVoltageU
~
 T5 30113 30114 30042 30043
PhasetophasevoltageU
12
 T5 30118 30119 30081 30082
PhasetophasevoltageU
23
 T5 30120 30121 30083 30084
PhasetophasevoltageU
31
 T5 30122 30123 30085 30086
Avg.phasetophaseVoltageU
pp
~

T5 30124 30125 30079 30080
CurrentI
1
 T5 30126 30127 30036 30037
CurrentI
2
 T5 30128 30129 30038 30039
CurrentI
3
 T5 30130 30131 30040 30041
TotalCurrentI T5 30138 30139 30034 30035
NeutralcurrentIn T5 30132 30133 30074 30075
RealPowerP
1
 T6 30142 30143 30020 30021
RealPowerP
2
 T6 30144 30145 30022 30023
RealPowerP
3
 T6 30146 30147 30024 30025
TotalRealPowerP T6 30140 30141 30018 30019
ReactivePowerQ
1
 T6 30150 30151 30028 30029
ReactivePowerQ
2
 T6 30152 30153 30030 30031
ReactivePowerQ
3
 T6 30154 30155 30032 30033
TotalReactivePowerQ T5 30148 30149 30026 30027
ApparentPowerS
1
 T5 30158 30159 30052 30053
ApparentPowerS
2
 T5 30160 30161 30054 30055
ApparentPowerS
3
 T5 30162 30163 30056 30057
TotalApparentPowerS T7 30156 30157 30050 30051
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