Siemens SIMATIC PC 670, Equipment Manual

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Connecting and Switching on the Computing Unit
Release 04/02
3-22
Panel PC 670 Computing Unit, Equipment Manual
3.8 Using the Computing Unit in a SIMATIC S7 Network (MPI/DP)
Connecting an S7 PLC via the MPI/DP interface
Using the potential isolated*) MPI/DP interface, the computing unit can be
connected to a SIMATIC S7 PLC or a PROFIBUS network. Using the MPI
connection cable (5 m) for connection to the SIMATIC S7 CPUs (Order
No.: 6ES7901-0BF00-0AA0), only transmission rates of up to 187.5 Kbit/s are
possible. For baud rates from 1.5 Mbit/s, the PROFIBUS 12 Mbit/s (Order No.
6ES7901-4BD00-0XA0) connection cable is necessary.
MPI/DP Interface
6ES7901-0BF00-0AA0
(5 m long)
In interference environment:
Bus connector
6ES7972-0BB10-0XA0
or
6ES7972-0BB20-0XA0
Figure 3-11 Connection Using the MPI/DP Interface
To connect the computing unit to a SIMATIC S7 programmable controller, perform
the following steps:
1. Disconnect the computing unit from the mains power supply.
2. Plug the connecting cable onto the MPI/DP interface
!
Caution
Danger of damage being caused to the device
Before inserting the connecting cables, the static charge of your body, the device
and the connecting cables must be brought to the same potential. To do this, touch
the metal housing briefly.
*) Potential isolation within the SELV circuit.
Connection
Using the MPI/DP interface, it is possible to connect PCs with:
S
MPI networks (S7 200, S7 300 and S7 400) or
S
PROFIBUS-DP networks (DP components).