Glossary
Glossary-7
ET 200S Interface Module IM 151/CPU
A5E00058783-01
Memory Marker
Memory markers are part of the system memory of the CPU for storing interim
results. They can be accessed in units of a bit, byte, word or doubleword.
MMC
Micro Memory Card Memory module for SIMATIC systems. Can be used as a
load memory and portable data carrier.
MPI
The multipoint interface (MPI) is the SIMATIC S7 interface for programming
devices.
Nesting depth
One block can be called from another by means of a block call. The nesting
depth is the number of code blocks called at the same time.
Node
A device that can send, receive or amplify data via the bus, such as a DP
master, DP slave, RS 485 repeater or active star coupler.
OB Organization Block
OB Priority
The operating system of the CPU distinguishes between various priority classes,
such as cyclic program scanning and process interrupt-driven program scanning.
Each priority class is assigned organization blocks (OB) in which the S7 user
can program a response. The OBs have different standard priorities which
determine the order in which they are executed or interrupted in the event that
they are activated simultaneously.
Operating Mode
The SIMATIC S7 programmable controllers have the following operating modes:
STOP, START-UP, RUN.
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