Siemens NAN 67 Series Manual de servicio descargar pdf (Pagina 295)

Glossary-1

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

C79000-G7076-C504-02

Glossary

Absolute addressing specifies the location of the address which is currently

being processed.

Accumulators are registers in the CPU which act as intermediate buffers for

load, transfer, comparison, math, and conversion operations.

Actual parameters replace the formal parameters when function blocks (FB)

and functions (FC) are called.

Example: The formal parameter “Start” is replaced by the actual parameter

“I 3.6”.

An address is part of a STEP 7 statement instruction which determines the

medium the processor should use to do something. It can be addressed with

either an absolute or a symbolic name.

An address identifier is the part of the address which contains various data.

The data can include elements such as a value itself (data object) or the size

of a value with which the instruction can, for example, perform a logic

operation. In the instruction statement “L IB10” IB is the address identifier

(“I” indicates the memory input area and “B” indicates a byte in that area).

The address register is part of the registers in the communication part of the

CPU. They act as pointers for register indirect addressing (possible in STL).

An array is a complex data type which consists of data elements of the same

type. These elements can be elementary or complex.

Absolute

Addressing

Accumulator

Actual Parameter

Address

Address Identifier

Address Register

Array

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Siemens NAN 67 Series Manual de servicio Pagina 295