modbusSession (Variable type)

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Properties specific to modbusSession variables
WLanguage functions that use modbusSession variables

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Modbus functions

modbusSession (Variable type)

In french: modbusSession

The modbusSession type is used to identify a connection to a Modbus server.

Note: For more details on the declaration of this type of variable and the use of WLanguage properties, see Declaring a variable.

Example

// On crée une session et on se connecte au serveur Modbus à l'adresse 192.168.1.18 sur le port 3275
Session is modbusSession
Session = ModbusConnectTCP("192.168.1.18",3275)

// Si la connexion échoue, affiche l'erreur
IF ErrorOccurred = True THEN
	Trace(ErrorInfo())
ELSE
	// Ecrit une valeur dans le registre 0x42 du serveur.
	ModbusWriteRegister(Session, 0x42,0xCAFE)
END

// Déconnection du serveur
ModbusDisconnect(Session)

Properties

Properties specific to modbusSession variables

The following properties can be used to handle Modbus sessions:

Property name	Type used	Effect

IDEsclave	Integer	Slave ID. Used to change the slave ID without having to open a session again.
ResponseTimeout	Integer	Maximum timeout for a Modbus server response.

Remarks

WLanguage functions that use modbusSession variables

modbusSession variables can be handled using the following WLanguage functions:


ModbusConnectRTU	Connects a client to a Modbus slave via a serial port.
ModbusConnectTCP	Connects a client to a Modbus server via transmission control protocol (TCP).
ModbusDisconnect	Closes the Modbus session.
ModbusReadBit	Reads one or more bits from a Modbus slave, starting at a specific address.
ModbusReadFloat	Reads one or more single-precision floats from a Modbus slave, starting at a specific address.
ModbusReadRegister	Reads one or more registers from a Modbus slave, starting at a specific address.
ModbusWriteBit	Writes one or multiple bits to a specific address in a Modbus slave.
ModbusWriteFloat	Writes one or more single-precision floats to a Modbus slave, starting at a specific address.
ModbusWriteRegister	Writes one or more registers (16-bit values) to a Modbus slave, starting at a specific address.