Multipoint Interface (Mpi); Connectable Devices; Pg/Op-Cpu Communication; Communication And Interrupt Response Times - Siemens SIMATIC S7-400H Manual

Installation of a CPU 41x-H
4.6

Multipoint Interface (MPI)

Connectable Devices

You can, for example, connect the following nodes to the MPI:
• Programming devices (PG/PC)
• Operation and monitoring devices (OPs and TDs)
• Additional SIMATIC S7 programmable controllers
Some connectable devices take the 24 V supply from the interface. This voltage is
available there in a non-isolated form.

PG/OP-CPU Communication

A CPU can maintain several simultaneous online connections during
communication with programming devices/OPs. By default, one of these
connections is for a programming device and one is for an OP/operation and
monitoring unit.

Communication and Interrupt Response Times

Notice
The interrupt reaction times can be delayed by read and write jobs having a
maximum aggregate (approx. 460 byte).
CPU-CPU Communication
The option "Data exchange via S7 communication" is provided for the CPU-CPU
communication.
You can find additional information on this in the "Programming with STEP 7"
manual.
Connectors
Only use bus connectors with an angular outgoing cable for PROFIBUS DP and
programming device cables to connect devices to the MPI (see Installation Manual,
Chapter 7).
Multipoint Interface as DP Interface
You can also configure the MPI interface as a DP interface. To do this, you can
reconfigure the MPI interface under STEP 7 in SIMATIC Manager. You can use
this to set up a DP line with a maximum of 32 slaves.
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