Structure of a CPU 41x
2.10 PROFIBUS DP Interface
S7-400 Automation System, CPU Specifications
Manual, 10/2006, 6ES7498-8AA04-8BA0
2-23
2.10 PROFIBUS DP Interface
Availability
CPUs with a "PN" name suffix are equipped with a PROFINET DP interface as a plug-in
module. To be able to use this interface, you must first configure it in HW Config and then
load the configuration in the CPU.
Connectable Devices
The PROFIBUS DP interface is used to build up a PROFIBUS master system or to connect
PROFIBUS IO devices.
You can connect any compliant DP slave to the PROFIBUS DP interface.
Here, the CPU is operated either as a DP master or a DP slave which is connected via
PROFIBUS DP field bus to the passive slave stations or other DP masters.
Some devices use the 24 VDC power supply of the interface. This voltage is provided at the
PROFIBUS DP interface connected to a reference potential.
Connectors
Always use the bus connector for PROFIBUS DP or PROFIBUS cables used to connect
devices to the PROFIBUS DP interface (see the manual
S7-400 Automation System,
Hardware and Installation
).
Time synchronization Using PROFIBUS
As the time master, the CPU sends synchronization message frames to the PROFIBUS to
synchronize further stations.
As the time slave, the CPU receives the CPU synchronization message frames from other
time masters. One of the following devices can be a time master:
● A CPU 41x with internal PROFIBUS interface
● A CPU 41x with external PROFIBUS interface, for example CP 443-5
● A PC with a CP 5613 or CP 5614
Reference
You can find information about planning time synchronization in the manual
Process Control
System PCS7; Safety Concept
.
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