Campbell Scientific CR6 CR6 Measurement and Control System - Page 415
Declarations Modbus Programming, 6.3.2.2 CRBasic Instructions Modbus
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Section 8. Operation single Dim- or Public-variable array (read / write). Term. 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 CR6 fits both RTU and PLC definitions. 8.6.3.2 Programming for Modbus 8.6.3.2.1 Declarations (Modbus Programming) Table CRBasic Ports, Flags, Variables, and Modbus Registers (p. 415) shows the linkage between terminals configured for control, flags and Boolean variables and Modbus registers. Modbus does not distinguish between terminals configured for control, flags, or Boolean variables. By declaring only terminals configured for control, or flags, or Boolean variables, the declared feature is addressed by default. A typical CRBasic program for a Modbus application will declare variables and ports, or variables and flags, or variables and Boolean variables. Table 108. CRBasic Ports, Flags, Variables, and, Modbus Registers CR6 Feature Example CRBasic Declaration Equivalent Example Modbus Register Terminal Configured for Control Public Port(8) 00001 to 00009 Flag Boolean Variable Variable Public Flag(17) Public ArrayB(56) as Boolean Public ArrayV(20)* 00001 to 00018 00001 to 00057 40001 to 40041* or 30001 to 30041* *Because of byte-number differences, each CR6 domain variable translates to two Modbus domain input / holding registers. 8.6.3.2.2 CRBasic Instructions (Modbus) Complete descriptions and options of commands are available in CRBasic Editor Help. ModbusMaster() Sets up a CR6 as a Modbus master to send or retrieve data from a Modbus slave. Syntax ModbusMaster(ResultCode, ComPort, BaudRate, ModbusAddr, Function, Variable, Start, Length, Tries, TimeOut) ModbusSlave() Sets up a CR6 as a Modbus slave device. Syntax ModbusSlave(ComPort, BaudRate, ModbusAddr, DataVariable, BooleanVariable) 415
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