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Assigning Parameters to the CP 541 for the Connections
4.3
Configuring a DP Connection
Introduction
Assigning Parame-
ters to the CP 541
Step
1
Load DB1 into the programmer.
2
Enter the station number of the CP 541 with
parameter TLN in frame SL2.
3
Pure DP connection:
Assign the value PAS to parameter STA.
Mixed mode:
Assign the value AKT (default value) to pa-
rameter STA.
4
Remove the comment parentheses from
frame DPS.
5
Enter in parameter NWI the number of data
words from the DP master to the CP 541 (see
Appendix C).
6
Enter in parameter NWO the number of data
words from the CP 541 to the DP master (see
Appendix C).
7
Write the modified DB1 into the CP 541.
8
Switch the CP 541 to RUN.
4-4
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.
Action
Remark
–
The station number of the CP 541 must be
identical to the node address of the con-
nected PLC.
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.
For the change in frame DPS to become ef-
fective, you must remove the comment pa-
rentheses.
With the DP connection, you must always
keep to the entered value.
NWI and NWO must not simultaneously be
NWI and NWO must not simultaneously be
0.
–
Only upon a transition from STOP to RUN
will the changed DB1 be stored in EEPROM
of the CP 541.
Communications Processor CP 541
EWA 4NEB 812 6188-02
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