Campbell-scientific CR800 and CR850 Measurement and Control Systems Manuel d'utilisateur télécharger pdf (Page 351)

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101

Section 8. Operation

351

8.6.2.2 Terminology

Table Modbus to Campbell Scientific Equivalents (p. 351) lists terminology

equivalents to aid in understanding how CR800s fit into a SCADA system.

Table 84. 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 CR800

Master Usually a computer

Slave Usually a CR800

Field Instrument Sensor



8.6.2.2.1 Glossary of Terms

Coils(00001to09999)

Originally,"coils"referredtorelaycoils.InCR800s,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).

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