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ModbusReadRegister (Function) Reads one or more registers from a Modbus slave, starting at a specific address.
Session is modbusSession
Session = ModbusConnectTCP("192.168.1.7")
arrResponse is array of 5 2-byte int
IF ErrorOccurred = True THEN
Trace(ErrorInfo())
ELSE
arrResponse = ModbusReadRegister(Session, 0x42, 5, False)
IF ErrorOccurred = True THEN
Trace(ErrorInfo())
END
END
ModbusDisconnect(Session)
Sintaxis
Reading 1 register from a Modbus slave Ocultar los detalles
<Result> = ModbusReadRegister(<Session> , <Address> , <Read-only>)
<Result>: Integer Value of the register read (16-bit integer). <Session>: modbusSession variable Name of the modbusSession variable that corresponds to the communication session with the Modbus slave. <Address>: Integer Address of the register in the slave (between 0 and 65,535). <Read-only>: Boolean - True if the registers to be read are part of read-only data (Modbus function code 4 (Read Input Registers)).
- False if the registers to be read are part of read-write data (Modbus function code 3 (Read Multiple Holding Registers)).
Reading multiple registers from a Modbus slave Ocultar los detalles
<Result> = ModbusReadRegister(<Session> , <Address> , <Number of registers> , <Read-only>)
<Result>: Array Array of 16-bit integers that contains the values of the registers read. <Session>: modbusSession variable Name of the modbusSession variable that corresponds to the communication session with the Modbus slave. <Address>: Integer Starting address of the registers in the slave (between 0 and 65,535). <Number of registers>: Integer Number of registers to be read. <Read-only>: Boolean - True if the registers to be read are part of read-only data (Modbus function code 4 (Read Input Registers)).
- False if the registers to be read are part of read-write data (Modbus function code 3 (Read Multiple Holding Registers)).
Observaciones - This function blocks the application until the slave responds to the message or until the session timeout is exceeded.
- After calling ModbusReadRegister, it is recommended to check the ErrorOccurred variable to make sure there are no errors.
Clasificación Lógica de negocio / UI: Código neutro
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