Technical data

8.1 Basics of Data Transmission using Layer 2
Services
The following applies to the CP 5430 TF/CP 5431 FMS:
The firmware of the modules generates S5 frames from the data records of
the SIMATIC S5 PLC which comply with the requirements of the
PROFIBUS standard. The services of the first and second layer of the
ISO/OSI reference model are used. The services of layer 2 are also known
as FDL (Fieldbus Data Link) services. The terms used are explained in the
model or in the appendix.
What you need to know
➣ Which layer 2 services are available for data transmission?
➣ How do you use these services for data transfer?
➣ How does this type of data transmission function and how is it used
correctly?
➣ How to handle and check data transmission using these services from
the point of view of the control program.
Free Layer 2 Communication B8976060/02
Volume 1 8 - 2