PROFIBUS DP
5.1 CPU 41x-3 PN/DP as DP master / DP slave
S7-400 Automation System, CPU Specifications
Manual, 10/2006, 6ES7498-8AA04-8BA0
5-11
5.1.5 CPU 41x as DP slave
Introduction
This section describes the properties and technical specifications of the CPU if you operate it
as a DP slave.
Reference
You can find the features and technical specifications of the 41x CPUs in the section
Technical Specifications
.
Requirements
● Only one DP interface of a CPU can be configured as a DP slave.
● Will the MPI/DP interface be a DP interface? If so, you must configure the interface as a
DP interface.
Before commissioning you must configure the CPU as a DP slave. In other words, you
must do the following in STEP 7
– Activate the CPU as a DP slave,
– Assign a PROFIBUS address,
– Assign a slave diagnostic address
– Define the address areas for data transfer to the DP master
Configuration and Parameter Assignment Frame
When you configure and assign parameters to CPU 41x, you are supported by
STEP 7
. If
you require a description of the configuration and parameter assignment frame to carry out a
check with a bus monitor, for example, you will find it on the Internet at
http://www.ad.siemens.de/simatic-cs under the entry ID 1452338.
Monitoring/Modifying and Programming via PROFIBUS
As an alternative to the MPI interface, you can use the PROFIBUS DP interface to program
the CPU or execute the programming device functions Monitor and Modify. To do this, you
must enable these functions when you configure the CPU as DP slave in
STEP 7
.
Note
The use of Programming or Monitor and Modify via the PROFIBUS DP interface extends the
DP cycle.
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