Siemens Simatic S7-400 - Manual (Page 617)

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.