4-4
Communications Processor CP 541
EWA 4NEB 812 6188-02
4.3
Configuring a DP Connection
You have a choice of two configurations for the DP connection. You can op-
tionally operate the CP 541 purely as a DP slave or in mixed mode with a
PLC-PLC connection and broadcast.
You assign parameters for the DP connection via the CP 541 as shown in the
following table.
Step
Action
Remark
1
Load DB1 into the programmer.
–
2
Enter the station number of the CP 541 with
parameter TLN in frame SL2.
The station number of the CP 541 must be
identical to the node address of the con-
nected PLC.
3
Pure DP connection:
Assign the value PAS to parameter STA.
Mixed mode:
Assign the value AKT (default value) to pa-
rameter STA.
With STA = PAS, the CP 541 becomes
purely a DP slave. SINEC L2-DP is thus
speeded up.
With STA = AKT, the CP 541 allows PLC-
PLC connection, broadcast and DP connec-
tion.
4
Remove the comment parentheses from
frame DPS.
For the change in frame DPS to become ef-
fective, you must remove the comment pa-
rentheses.
5
Enter in parameter NWI the number of data
words from the DP master to the CP 541 (see
Appendix C).
With the DP connection, you must always
keep to the entered value.
NWI and NWO must not simultaneously be
6
Enter in parameter NWO the number of data
words from the CP 541 to the DP master (see
Appendix C).
NWI and NWO must not simultaneously be
0.
7
Write the modified DB1 into the CP 541.
–
8
Switch the CP 541 to RUN.
Only upon a transition from STOP to RUN
will the changed DB1 be stored in EEPROM
of the CP 541.
Introduction
Assigning Parame-
ters to the CP 541
Assigning Parameters to the CP
541 for the Connections