S7-300, CPU 31xC and CPU 31x: Installation
Operating Instructions, Edition 08/2004, A5E00105492-05
Glossary-1
Glossary
Accumulator
Accumulators represent CPU registers, used as interim memory for load, transfer
comparison, arithmetical and conversion operations.
Address
The identifier for a certain address or address or address range. Examples: Input I 12.1;
memory Word MW 25; Data Block DB 3.
Analog module
Analog modules convert process values (e.g. temperature) into digital values which can be
processed in the CPU, or they convert digital values into analog manipulated variables.
Application
See User program
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.
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.
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