Campbell Scientific CR6 CR6 Measurement and Control System - Page 414
Modbus Terminology
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Section 8. Operation DevConfig or the Status table (see the appendix Status Table and Settings (p. 581) ) can be set to keep communication ports open and awake, but at higher power usage. 8.6.3.1 Modbus Terminology Table Modbus to Campbell Scientific Equivalents (p. 414) lists terminology equivalents to aid in understanding how CR6s fit into a SCADA system. Table 107. 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 CR6 Master Usually a computer Slave Usually a CR6 Field Instrument Sensor 8.6.3.1.1 Glossary of Modbus Terms Term. coils (00001 to 09999) Originally, "coils" referred to relay coils. In CR6s, coils are exclusively terminals configured for control, 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. Term. digital registers 10001 to 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). Term. input registers 30001 to 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). Term. holding registers 40001 to 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 414
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