Siemens S7-300 appendix Asic

Glossary

Accumulator

Accumulators represent CPU register and are used as buffer memory for download, transfer, comparison, calculation and conversion operations.

Address

An address is the identifier of a specific address or address area. Examples: Input I 12.1; Flag Word MW 25; Data Block DB 3.

Analog module

Analog modules convert process values (e.g. temperature) into digital values which can be processing in the CPU, or they convert digital values into analog manipulated variables.

Application

An application is a program that runs directly on the MS-DOS / Windows operating system. Applications on the PG include, for example, the STEP 5 basic package, GRAPH 5 and others.

See User program

ASIC

ASIC is the acronym for Application Specific Integrated Circuits.

PROFINET ASICs are components with a wide range of functions for the development of your own devices. They implement the requirements of the PROFINET standard in a circuit and allow extremely high packing densities and performance.

Because PROFINET is an open standard, SIMATIC NET offers PROFINET ASICs for the development of your old devices under the name ERTEC .

Backplane bus

The backplane bus is a serial data bus. It supplies power to the modules and is also used by the modules to communicate with each other. Bus connectors interconnect the modules.

CPU 31xC and CPU 31x, Technical data	Glossary-1
Manual, Edition 08/2004, A5E00105475-05