Exchange Of Data Between S5-95U And Dp Slaves - Siemens SIMATIC S5 Manual

Design and method of operation of the S5-95U with DP master interface
4.3

Exchange of data between S5-95U and DP slaves

Exchange of data
Functions of the
control processor
Functions of the
communication
processor
4-6
The S5-95U and the DP slaves exchange data through the agency of the
control and communication processors in the S5-95U.
The link to SINEC L2 DP is established via the DP master interface.
The functions discharged by the control processor of the S5-95U with regard
to communication via SINEC L2 DP are as follows:
Load DP parameter set from 32 K EEPROM/ save to 32 K EEPROM
Ready output data for the DP slaves in the STEP 5 application program
Process the master and slave diagnostics in the STEP 5 application
program (diagnostics fetched by FB 230)
Process input data in the STEP 5 application program and pass on to the
I/O of the S5-95U
The communication processor of the S5-95U handles the data traffic via the
SINEC L2 DP parallel to the control processor. Its functions are as follows:
Accept the token (send authorization) from a DP master and pass on the
token to another DP master
Parameterize DP slaves (send parameterization data to DP slaves)
Copy input data from the receive buffer of the communication processor
to the address space in the S5-95U (control processor)
Copy output data from the address space of the S5-95U (control
processor) to the send buffer of the communication processor
ET 200 Distributed I/O System
EWA 4NEB 780 6000-02a