ModbusWriteBit (Function)

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ModbusWriteBit (Function)

In french: ModbusEcritBit

Writes one or multiple bits to a specific address in a Modbus slave.

Remarks:

This function blocks the application until the slave acknowledges the message or until the session timeout is exceeded.
The single-bit write operation corresponds to Modbus function code 05 (Write Single Coil).
The multiple-bit write operation corresponds to Modbus function code 15 (Write Multiple Coils).

Example

// Crée une session et connexion à un serveur Modbus
Session is modbusSession
Session = ModbusConnectTCP("192.168.1.7")

// Si la connexion échoue, affiche l'erreur
IF ErrorOccurred = True THEN
	Trace(ErrorInfo())
ELSE
	// Ecrit une séquence de 5 bits à partir de l'adresse 0x42.
    IF NOT ModbusWriteBit(Session, 0x42, [1,0,1,1,0]) THEN
	 Trace(ErrorInfo())
    END
END    

// Déconnexion
ModbusDisconnect(Session)

Syntax

Writing 1 bit to a Mobdus slave Hide the details

<Result> = ModbusWriteBit(<Session> , <Address> , <Bit>)

<Result>: Boolean

True if written successfully,
False otherwise. To get more details on the error, use ErrorInfo with the errMessage constant.

<Session>: modbusSession variable

Name of the modbusSession variable that corresponds to the communication session with the Modbus slave.

<Address>: Integer

Value between 0 and 65,535 that corresponds to the address (slave) to which the bit must be written.

<Bit>: Boolean

Value of bit to be written: True or False.

Writing multiple bits to a Modbus slave Hide the details

<Result> = ModbusWriteBit(<Session> , <Address> , <Bits to be sent>)

<Result>: Boolean

True if written successfully,
False otherwise. To get more details on the error, use ErrorInfo with the errMessage constant.

<Session>: modbusSession variable

Name of the modbusSession variable that corresponds to the communication session with the Modbus slave.

<Address>: Integer

Value between 0 and 65,535 that corresponds to the address (slave) to which the bits must be written.

<Bits to be sent>: Array of booleans

Name of the Array variable that contains the bits to be sent.

Remarks

CAUTION: As writing operations involve the manipulation of automation devices, it is advisable to test the various commands before putting them into production, to ensure that the devices perform the required operations.

Business / UI classification: Business Logic

Component: wd300com.dll