Siemens S7-400 installation manual MPI Address, Nesting Depth, Network, Node Number, Non-Isolated

Glossary

Multipoint Interface (MPI)

The multipoint interface is the programming device interface in SIMATIC S7. 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.

Automation System S7-400	Hardware and Installation	Glossary-9
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