PB_CNCT (FB)¶

FUNCTION_BLOCK PB_CNCT

This function block can be used for establishing a DPV1 Class 2 connection to a PROFIBUS Slave. The connection is established and kept open if input REQ = TRUE, it’s closed when REQ = FALSE. While the connection is in state open, the ID output has a value that can be used as ID input of RDREC or WRREC.

InOut:

Scope	Name	Type	Initial	Comment
Input	REQ	BOOL		Start Request
	MASTER	BYTE		Master ID
	SEGMENT	BYTE		Always set to 0.
	STATION	BYTE		Station address of the target
	SLOT	BYTE		Slot number of the target
Output	VALID	BOOL		Connection is valid
	ERROR	BOOL		Error detected
	BUSY	BOOL		FB is busy
	STATUS	DWORD		Last detected status
	ID	DWORD	CommFB.Constants.INVALID_ID	Identifier of a PB Slave. Use for RDREC or WRREC (Class 2)