beautypg.com

Siemens Simatic S7-400 User Manual

Page 617

background image

Glossary

Glossary-11

S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07

Measuring range module

Measuring range modules are plugged into the analog input modules for
adaptation to different measuring ranges.

Memory card

Pluggable load memory. Memory cards are credit-card size storage media for
CPUs and CPs. They are implemented as

³

RAM or

³

FEPROMs.

Memory reset

In a memory reset, the following memories of the CPU are deleted: working
memory, write/read area of the load memory, system memory.
In S7 and M7, the MPI parameters and diagnostic buffer are preserved.
In M7, the operating system is also rebooted when the memory of the M7
computer is reset by means of the mode selector.

Mode selector

Using the mode selector, the user can set the current operating mode of the CPU
(RUN, RUN-P, STOP) or reset the memory of the CPU (MRES).

Module filtering mode

By operating mode we mean:
1. The selection of an operating mode of the CPU using the mode switch or the
PG
2. The type of program execution in the CPU

MPI

The multipoint interface (MPI) is the programming device interface of the
SIMATIC S7. It is used to access programmable modules (CPUs, CPs), text
displays and operator panel from a central point. The nodes on the MPI can
communicate with each other.

Multicomputing

Multicomputing operation is the synchronous operation of several (2 to 4) CPUs
in an appropriate central rack of the S7-400.

Multiprocessor operation

During multiprocessor operation, several CPUs access one or more master
interfaces for

³

PROFIBUS DP.

This manual is related to the following products: