MBSlaveUDPex

Function Block - MODBUS UDP Slave protocol on ETHERNET.

Inputs

Input	Data type	Description
IN	BOOL	Enabling command: the port is open when this input is TRUE.
PORT	DINT	ETHERNET port number.
SLV	DINT	MODBUS slave number.
RTU	BOOL	Protocol: TRUE = MODBUS RTU / FALSE = Open MODBUS.
SrvID	STRING	MBSlaveUDPex only: ID of the server in the configuration.

Outputs

Output	Data type	Description
Q	BOOL	TRUE if the port is successfully open.

Remarks

When active, this function block manages the MODBUS UDP Slave protocol on the specified ETHERNETport. The configuration of the MODBUS Slave map (designing MODBUS addresses) is done using the MODBUS configuration tool, from the Fieldbus Configurator.

There can be several instances of the MBSlaveUDP working simultaneously on different UDP ports. Other MODBUS Slave connections (TCP server, serial) can also be active at the same time.

The slave number entered in the MODBUS Slave configuration tool is ignored when MODBUS Slave protocol is handled by this function block. Instead, the SLV input specifies the MODBUS slave number. If SLV is 0 then the default port number from the MODBUS configuration is used.

With MBSlaveUDPex, you can specify the ID of a server from the MODBUS slave configuration. If you specify an empty string, the first server is used. MBSlaveUDP always works with the first server in the configuration.

With MBSlaveRTUex, you can specify the ID of a server from the MODBUS slave configuration. If you specify an empty string, the first server is used.

ST Language

MySlave is a declared instance of MBSlaveUDP function block.

MySlave (IN, PORT, SLV, RTU, SrvID);
Q := MySlave.Q;

MBSlaveUDPex

IEC 61131-3 Automation platform > Programming - Reference guide > Driver specific function blocks > Modbus Slave > MBSlaveUDPex

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