Siemens NCM S7 appendix Explanation of the Formal Parameters

Programming FCs (Functions) and FBs for S7 Ethernet CPs

Note

In principle, it is possible to call the FC more than once within the CPU cycle to speed up the handling of the job. Do not forget, however, that this increases the load during the CPU cycle (the load differs depending on the CPU type)!

Explanation of the Formal Parameters

The following table explains all the formal parameters for the AG_SEND /AG_LSEND functions.

Parameter	Declara-	Type	Possible	Remarks
	tion		Values
ACT	INPUT	BOOL	0,1	If an FC is called with ACT=1, LEN bytes are
				sent from the ISO transport data area specified
				with the SEND parameter.
				If an FC is called with ACT = 0, the status
				codes DONE, ERROR and STATUS are
				updated.
ID	INPUT	INT	1,2...64	The connection number of the connection is
			(S7-400)	specified in the parameter ID. (see
			1,2...16	Configuration Section 4.3.1
			(S7-300)
LADDR	INPUT	WORD		Module base address
				When you configure the CP with STEP 7
				hardware configuration, the module base
				address is displayed in the configuration table.
				Specify this address here.
SEND	INPUT	ANY		Specifies the address and length.
				The address of the data area refers to one of
				the following:
				– Process image area
				– Bit memory
				– Data block area

178	SIMATIC NET NCM S7 for Industrial Ethernet
	Release 6/2003

C79000–G8976–C129–07