Siemens simatic c7-621 Hardware Installation Manual page 128

Glossary
Isolated In isolated input/output modules, the reference potentials of the control
circuit and the load circuit are electrically isolated by, for example,
optocouplers, relay contactors or transformers. Input/output circuits can be
connected to common potential.
L
Load Memory The load memory is a part of the C7 CPU. It contains objects (load objects)
created by the programming device.
M
Memory Reset When you clear the –> C7 CPU, the following memories are deleted:
and the user program is reloaded from the –> flash memory.
When you clear the –> C7 OP the following memories are deleted:
The C7 OP then no longer contains a user configuration.
MPI The multipoint interface (MPI) is the programming device interface of
SIMATIC S7. It allows simultaneous operation of several nodes
(programming devices, text displays, operator panels) on one or several
CPUs. The nodes on the MPI are connected to each other via a network. Each
node is identified by a unique address (MPI address).
MPI Network
A network connects several C7s and/or S7-300s and further DTEs, such as
programming devices, via a –> connecting cable. Data are exchanged
between the connected devices over the network.
Glossary-6
The –> work memory
The read/write memory area of the –> load memory
The –> system memory
The –> backup memory
The –> work memory
The –> configuration memory
C7-621 / C7-621 AS-i Control Systems
C79000-G7076-C621-01