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.