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Glossary-4

Ladder Logic (LAD) for S7-300 and S7-400

C79000-G7076-C504-02

First check of the result of logic operation.

A folder on the user interface of the SIMATIC Manager that can be opened

and that can contain other folders and objects.

A formal parameter is a stand-in for the actual parameter in logic blocks. In

function blocks (FBs) and functions (FCs) the formal parameters are declared

by the user, in system function blocks (SFBs) and system functions (SFCs)

they are already available. When a block is called, formal parameters are

assigned actual parameters; the block works with the actual parameters.

The formal parameters are classed as local data. They can be input, output, or

in/out parameters.

According to the International Electrotechnical Commission’s IEC 1131–3

standard, functions are logic blocks that do not reference an instance data

block, meaning they do not have a ’memory’. A function allows you to pass

parameters in the user program, which means they are suitable for

programming frequently recurring, complex functions, such as calculations.

According to the International Electrotechnical Commission’s IEC 1131–3

standard, function blocks are logic blocks that reference an instance data

block, meaning they have static data. A function block allows you to pass

parameters in the user program, which means they are suitable for

programming frequently recurring, complex functions, such as closed-loop

control and operating mode selection.

Function Block Diagram is one of the programming languages in STEP 7.

FBD represents logic in the boxes familiar from Boolean algebra. In STEP 5,

this language is known as Control System Flowchart (CSF).

In immediate addressing the address contains the value with which the

instruction works.

Example: L.27 means load constant 27 into accumulator.

First Check Bit

Folder

Formal Parameter

Function (FC)

Function Block

(FB)

Function Block

Diagram (FBD)

Immediate

Addressing

Glossary

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Siemens NAN 67 Series Manual de servicio Pagina 298