Siemens PC 670 User Manual

Page 56

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:

MPI networks (S7 200, S7 300 and S7 400) or

PROFIBUS-DP networks (DP components).