Interfaces, Networks and Data Communication for the S7-400
5-6
Automation System S7-400 Configuration and Use
A5E0044271 1-02
5.2.2 I/O Interface via PROFIBUS DP
Introduction
The flexibility of a controller is a crucial factor for the productivity of a
manufacturing plant. To achieve the highest degree of flexibility, complex control
tasks can be grouped and distributed to several devices. This brings the following
advantages:
• Signals can be acquired locally, saving costs.
• You get easy-to-handle small units. You can easily configure, commission,
perform diagnostics, change, operation and monitor the entire process.
• You have more control over your plant. If a unit fails, the remaining system can
continue operating.
The solution is called PROFIBUS DP.
You can meet the increasing demand on data volume and the associated transfer
speeds needed for this with PROFIBUS DP.
With the DP interface of the S7-400 CPU, connecting ET 200 distributed I/O and
standard slaves poses no problem.
Use and Area of Application
I/O interfacing via PROFIBUS DP can be used in the following situations:
• You want a distributed configuration for you plant.
• You want to use the S7-400 with the tried-and-proven components of the ET
200 distributed I/O system.
Typical Configuration
PROFIBUS DP consists of a DP master and multiple DP slaves, PROFIBUS with
the DP protocol and STEP 7 for assigning parameters to the PROFIBUS DP
configuration.
• DP master: The DP master links the controller with the distributed I/O systems.
It exchanges data with the distributed I/O via PROFIBUS DP and monitors the
fieldbus.
• DP slaves: I/O devices are connected as DP slaves. The DP slaves prepare the
encoder and actuator data on-site so that they can be transmitted via
PROFIBUS DP.
• Programming device / PC: STEP 7, installed on the programming device or PC,
is used to configure the assembly and put PROFIBUS DP into service.
S7-400 as DP Master / DP Slave
You can integrate the S7-400 as a DP master or a DP slave in PROFIBUS DP.
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