B-1
Communications Processor CP 541
EWA 4NEB 812 6188-02
Optimizing SINEC L2
By optimizing the parameters in DB1, you can speed up message processing
in the CP 541 and, therefore, also SINEC L2.
A full description of DB1 is given in Appendix C.
You specify the SAP (service access point) for broadcast with parameter
BSAP. Additionally, you can suppress the broadcast with BSAP.
The greater the number of broadcast messages sent from the CP 541 to the
connected programmable controller, the longer is the duration of the entire
data transmission to this programmable controller.
You can optimize parameter BSAP as follows:
If you do not wish to send or receive a broadcast, you must assign the value 0
to parameter BSAP. The CP 541 will then not send any received broadcast
messages to the connected programmable controller.
If you still generate a broadcast in your user program and send it to the
CP 541, the CP 541 will generate an error message and go to the STOP state.
You affect the degree of management for SINEC L2 in the CP 541 with pa-
rameter HSA. You use parameter HSA to specify the active station with the
highest station number.
Each active station must manage its own polling list with all L2 stations in
SINEC L2. When the token is passed on, all stations not entered in the list
which are located between the own station number and the station number of
the next active station, are called cyclically.
Introduction
Parameter BSAP
Optimization
Parameter HSA
B
