Siemens Simatic S7-400 - Manual (Page 443)

CPUs for M7-400
11-15
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
11.3.7 Multipoint Interface (MPI)
X1 Interface
The X1 interface of the CPU 486-3 and CPU 488-3 for connecting devices such as
PCs/programming devices is a multipoint interface (MPI) and is connected via a
9-pin sub D connector.
Suitable Devices
You can connect the following at the MPI:
• Programming devices (PGs/PCs)
• Operator panels (OPs)
• Additional CPUs.
You can address up to 127 communications partners (programming devices, OPs,
CPUs) via the multipoint interface of the CPU 486-3 and CPU 488-3. A maximum
of 44 connections can be made to the CPU.
Connectors
Use only bus connectors or PG cables for connecting devices to the MPI (see
Chapter 6).