ModbusServer (FB)¶

FUNCTION_BLOCK ModbusServer

Tis function block processes up to 16 parallel client connection requests by Modbus TCP.

InOut:

Scope	Name	Type	Initial	Comment
Input	wPort	WORD	502	Modbus server port - 502 is Modbus default
	pInputData	POINTER TO WORD		Input Registers
	pOutputData	POINTER TO WORD		Holding Registers
	uiInputDataSize	UINT		Size in words of Input Register data area
	uiOutputDataSize	UINT		Size in words of Output Register data area
	xEnable	BOOL	FALSE	Flag to enable execution - default is FALSE
	xReset	BOOL	FALSE	Flag to reset - default is FALSE
	tTimeout	UDINT	0	Modbus request timeout. If specified, the modbus data area that is updated by client (Holding Registers, Coils) is reset. Output xTimeout is TRUE.
	InterfaceName	WSTRING(255)		Name of ethernet interface (optional). If specified, the modbus server binds to the IP address of this interface.
Output	xBusy	BOOL		function block is active
	xError	BOOL		an Error occured
	byClientConnections	BYTE	0	Number of open TCP-connections
	xTimeout	BOOL		Timeout expired. Holding Registers and Coils are set to zero.