DTCBufferWriter (FB)

FUNCTION_BLOCK DTCBufferWriter EXTENDS DTCHandlerBase

This function block can be connected to a DM1_Read or DM2_Read function block. As long as xEnable is TRUE it receives DTCs and writes it to a memory buffer provided by pDTCBuffer. If a complete diagnostic message was received output xReceived becomes TRUE for one cycle and pDTCBuffer contains received DTCs. If buffer is too small DTCs can be lost (see output udiDTCLostCount).

Note

Output values and Data in pDTCBuffer is only valid as long as xReceived is TRUE (for one cycle).

InOut:

Scope	Name	Type	Comment	Inherited from
Input	xEnable	BOOL	TRUE: Action starts FALSE: Action stops, outputs xDone, xBusy, xError are resetted	LTrig
Output	xDone	BOOL	TRUE: Action successfully completed	LTrig
	xBusy	BOOL	TRUE: Function block active	LTrig
	xError	BOOL	TRUE: Error occurred, function block aborts action FALSE: No error	LTrig
Input	itfDTCHandlerList	IDTCHandlerList	DMx_Read instance	DTCHandlerBase
Output	eError	ERROR	detailed error information if xError is TRUE	DTCHandlerBase
Input	pDTCBuffer	POINTER TO DTC	Pointer to ARRAY OF DTC. If xReceived is TRUE buffer contains received DTC information. Note: Data is only valid as long as xReceived is TRUE.
Input	udiDTCBufferCount	UDINT	Number of DTCs fitting into pDTCBuffer
Output	udiDTCReceiveCount	UDINT	Number of DTCs written to pDTCBuffer. Only valid if xReceived is TRUE.
	udiDTCLostCount	UDINT	Number of dismissed DTCs. If greater 0 buffer is too small.
	xReceived	BOOL	TRUE for one cycle if a diagnostic message was received. pDTCBuffer contains DTC information.