Campbell-scientific CR3000 Micrologger Manual de usuario descargar pdf (Pagina 373)

100

101

Section 8. Operation

373

Table 91. Modbus to Campbell Scientific Equivalents

Modbus Domain Data Form Campbell Scientific Domain

Coils Single Bit Ports, Flags, Boolean Variables

Digital Registers 16-bit Word Floating Point Variables

Input Registers 16-bit Word Floating Point Variables

Holding Registers 16-bit Word Floating Point Variables

RTU / PLC CR3000

Master Usually a computer

Slave Usually a CR3000

Field Instrument Sensor



8.6.2.2.1 Glossary of Terms

Coils(00001to09999)

Originally,"coils"referredtorelaycoils.InCR3000s,coilsareexclusively

ports,flags,oraBoolean‐variablearray.Portsareinferredifparameter

5oftheModbusSlave()instructionissetto0.Coilsareassignedto

Modbusregisters00001to09999.

DigitalRegisters10001‐19999

Holdvaluesresultingfromadigitalmeasurement.Digitalregistersinthe

Modbusdomainareread‐only.IntheCampbellScientificdomain,the

leadingdigitinModbusregistersisignored,andsoareassigned

togethertoasingleDim‐orPublic‐variablearray(read/write).

InputRegisters30001‐39999

Holdvaluesresultingfromananalogmeasurement.Inputregistersin

theModbusdomainareread‐only.IntheCampbellScientificdomain,

theleadingdigitinModbusregistersisignored,andsoareassigned

togethertoasingleDim‐orPublic‐variablearray(read/write).

HoldingRegisters40001‐49999

Holdvaluesresultingfromaprogrammingaction.Holdingregistersin

theModbusdomainareread/write.IntheCampbellScientificdomain,

theleadingdigitinModbusregistersisignored,andsoareassigned

togethertoasingleDim‐orPublic‐variablearray(read/write).

RTU/PLC

RemoteTelemetryUnits(RTUs)andProgrammableLogicControllers

(PLCs)wereatonetimeusedinexclusiveapplications.Astechnology

increases,however,thedistinctionbetweenRTUsandPLCsbecomes

moreblurred.ACR3000fitsbothRTUandPLCdefinitions.

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