Communication
4.1 interfaces
S7-400 Automation System, CPU Specifications
Manual, 10/2006, 6ES7498-8AA04-8BA0
4-3
Time synchronization via PROFIBUS DP
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
Devices capable of PROFIBUS DP communication
The PROFIBUS DP interface is used to build up a PROFIBUS master system or to connect
PROFIBUS IO devices.
The following devices can be connected to the PROFIBUS DP interface:
● PG/PC
● OP/TP
● PROFIBUS DP slaves
● PROFIBUS DP master
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.
Reference
Further information on PROFIBUS: http://www.profibus.com
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