Campbell-scientific CR1000 Measurement and Control System Manuel d'utilisateur Page 368

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Vue de la page 367
Section 8. Operation
368
8.6.2.2 Terminology
Table Modbus to Campbell Scientific Equivalents (p. 368) lists terminology
equivalents to aid in understanding how CR1000s fit into a SCADA system.
Table 88. 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 CR1000
Master Usually a computer
Slave Usually a CR1000
Field Instrument Sensor
8.6.2.2.1 Glossary of Terms
Coils(00001to09999)
Originally,"coils"referredtorelaycoils.InCR1000s,coilsareexclusively
ports,flags,oraBooleanvariablearray.Portsareinferredifparameter
5oftheModbusSlave()instructionissetto0.Coilsareassignedto
Modbusregisters00001to09999.
DigitalRegisters1000119999
Holdvaluesresultingfromadigitalmeasurement.Digitalregistersinthe
Modbusdomainarereadonly.IntheCampbellScientificdomain,the
leadingdigitinModbusregistersisignored,andsoareassigned
togethertoasingleDimorPublicvariablearray(read/write).
InputRegisters30001‐39999
Holdvaluesresultingfromananalogmeasurement.Inputregistersin
theModbusdomainarereadonly.IntheCampbellScientificdomain,
theleadingdigitinModbusregistersisignored,andsoareassigned
togethertoasingleDim‐orPublic‐variablearray(read/write).
HoldingRegisters40001‐49999
Holdvaluesresultingfromaprogrammingaction.Holdingregistersin
theModbusdomainareread/write.IntheCampbellScientificdomain,
theleadingdigitinModbusregistersisignored,andsoareassigned
togethertoasingleDim‐orPublicvariablearray(read/write).
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