Glossary
Local data
Data, temporary
Master
When a master is in possession of the token, it can send data to other nodes and request
data from other nodes (= active node).
Micro memory card (MMC)
Micro memory cards are memory media for CPUs and CPs. The difference to the memory
card is the smaller size.
MPI
The multi-point interface (MPI) is the SIMATIC S7 interface for programming devices. It
allows simultaneous operation of several nodes (programming devices, text displays,
operator panels) on one or more CPUs. Each node is identified by a unique address (MPI
address).
Nesting depth
Using block calls, one block can be called from within another. Nesting depth is referred to
as the number of simultaneously called code blocks.
OB priority
The CPU operating system distinguishes between different priority classes, for example,
cyclic program execution, process interrupt controlled program processing. Each priority
class is assigned organization blocks (OBs) in which the S7 user can program a response.
Per default, OBs have different priorities and they are processed and interrupt each other
according to their priority classes.
Operating mode
SIMATIC S7 automation systems know the following operating modes: STOP, STARTUP,
RUN.
Operating system of the CPU
The operating system of the CPU organizes all the functions and processes of the CPU that
are not connected to a special control task.
Organization block
Organization blocks (OBs) form the interface between CPU operating system and the user
program. The sequence for executing the user program is specified in the organization
blocks.
S7-300 CPU Data: CPU 315T-2 DP
Glossary-6 Manual, 12/2005, A5E00427933-02
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