Starting Up
6-17
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01
6.9 Starting Up a PROFIBUS-DP Subnet
Introduction
This section describes the procedure for starting up a PROFIBUS-DP subnet with
a CPU 413-2 DP, 414-2 DP, or 416-2 DP as the DP master.
Requirements
Before you can start up the PROFIBUS-DP subnet, the following requirements
must be met:
The PROFIBUS-DP subnet has been set up (see Chapter 7).
With STEP 7, you have configured the PROFIBUS-DP subnet and assigned a
PROFIBUS-DP address and the address area to all nodes (see
STEP 7 User
Manual
). Note that for some DP slaves, address switches must also be set (see
the reference manuals for the particular DP slaves).
Starting Up
1. Use the programming device to load the configuration of the PROFIBUS-DP
subnet created under STEP 7 (preset configuration) in the CPU. This procedure
is described in the manual
Configuring Hardware and Communication
Connections with STEP 7 V5.0
.
2. Switch on all DP slaves.
3. Switch the CPU from STOP to RUN.
Behavior of the CPU During Startup
During startup, the CPU compares the preset and actual configurations. You set
the duration of the test with STEP 7 in the “Startup” parameter block with the
“module time limits” parameter.
If the preset configuration = actual configuration, the CPU goes to RUN.
If the preset configuration 0 actual configuration, the CPU’s reaction depends on
the setting of the parameter for “Startup if preset configuration 0 actual
configuration”:
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