Programming FCs (Functions) and FBs for S7 Ethernet CPs

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

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Siemens S7 appendix Explanation of the Formal Parameters, Parameter Declara Type Possible Remarks Tion Values

S7 specifications

The Siemens S7 series represents a cornerstone in the realm of programmable logic controllers (PLCs), developed by Siemens, a leading company in industrial automation. Widely used across various industries, the S7 series offers robust solutions for controlling machinery and processes, thanks to its reliable performance, flexibility, and scalable architecture.

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In conclusion, the Siemens S7 series stands out due to its modular design, range of models suitable for various applications, advanced communication technologies, and user-friendly programming software. This combination of features and characteristics makes S7 PLCs a preferred choice for industries seeking reliable and efficient automation solutions. As industrial demands continue to evolve, Siemens S7 PLCs remain at the forefront, adapting to technological advancements and setting benchmarks in the automation field.