Starting Up
6-5
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01
6.3 Connecting a Programming Device (PG) to an S7-400
Connecting a Programming Device (PG) to an S7-400
You must connect the programming device via a connecting cable to the MPI of the
CPU. This allows access via the communication bus to all CPUs and
programmable modules.
PG cable
S7-400
Programming device
Note
The programming device is not ungrounded. To operate the S7-400 in an
ungrounded configuration, you must connect the programming device via an
RS 485 repeater (see
Reference Manual
, Chapter 10).
Communication between Programming Device and CPU
The following conditions apply when communicating between a programming
device and a CPU:
You need a programming device with STEP 7.
The CPU can communicate with the programming device in the following
modes: RUN-P, RUN, STOP, STARTUP, and HOLD.
Operator Control
A description of operator control of communication between CPUs and
programming devices can be found in the STEP 7 manuals.
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