ModbusValue

ModbusValue (FB)

FUNCTION_BLOCK ModbusValue

InOut:

Scope	Name	Type	Initial	Comment
Input	xEn	BOOL	FALSE	Enables/Disables the function block ( TRUE = Enable )
Input	Value	__SYSTEM.AnyType		The value to read/write. It can be any IEC data type such as BOOL, WORD, INT, FLOAT…
Input	byUnitId	BYTE	1	In case of Modbus-RTU enter the slave ID. In case of Modbus- TCP or Modbus-UDP the unit is required
Input	byFunctionCode	BYTE	3	The modbus function code (3 = read input registers, 4 = read holding registers…)
Input	wRegisterAddress	WORD		The modbus register address (zero based)
Input	eReadWriteType	Modbus_ReadWrite	Modbus_Read	The direction of data exchange (Modbus_Read, Modbus_Write or Modbus_Bidir)
Input	eModRcvOpMode	MODRCV_OPERATION_CODE		Operation mode regarding communication errors concerning Modbus-Receive-Telegrams
Input	wNumberOfCoils	WORD	0	Number of Coils / Inputs ( only for FC01 and FC02 )
Inout	ModbusClient	ModbusClientBase		Instance of ModbusClient (ModbusClient_RTU, ModbusClient_TCP, ModbusClient_RTU, …)
Output	eError	ModbusErrorCode	ModbusErrorCode.NO_ERROR	Current error code (0 = NO_ERROR if data exchange succeeded)
Output	xBusy	BOOL		TRUE during data exchange
Output	xChanged	BOOL		TRUE after data was successfully ready at the Value input (only for one cycle). Use this output for any needed byte manipulations
Output	eResponseState	Response_State_Code	Response_State_Code.STATE_INVALID
Output	wModRcvActDevErrCnt	WORD		Action for the device's Modbus communication error counter