Glossary
Glossary-9
AutomationSystem S7-400 Hardwareand Installation
A5E00850741-01
Multipoint Interface (MPI)
The multipoint interface is the programming device interface in SIMATICS7. It
enables the simultaneous operation of a number of nodes (programming devices,
text display operator interfaces, and operator panels) from one or more CPUs.
Each node is identified by an address (MPI address).
MPI Address
Multipoint Interface (MPI)
N
Nesting Depth
A block can be called from another block by means of block calls.The nesting
depth is the number of simultaneously called logic blocks.
Network
In communications, a network is the connection between two or more S7-400
CPUs and other terminals such as a programming device, via a connecting cable.
Data are exchanged over the network between the connected stations.
Node Number
The node number represents the accessing address of a CPU or programming
device or of another intelligent I/O module when they communicate with each other
via a network. The node number is assigned by the CPU or programming device
using the STEP 7 software.
Non-Isolated
In the case of non-isolated I/O modules, the reference potentials of the control and
load circuits are electrically connected to each other.