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Optimizing SINEC L2
Optimization
Parameter POL
Optimization
Parameter PRI
Optimization
B-2
You can optimize parameter HSA as follows:
Specify the station numbers of all active stations in a connected series.
Begin the addressing of active stations with station number 1.
Assign the station number of the highest active station to HSA.
Specify no reserve or only slight reserves for any active stations to be
inserted later.
Parameter POL affects the data transmission from the connected program-
mable controller to the CP 541. The default for POL is 100 ms (POL = 10).
By varying this value, you can interrogate the connected programmable con-
troller more or less frequently for messages to be sent, or fully suppress the
interrogation.
You can optimize parameter POL as follows. Observe the defaults of your
connected programmable controller, especially with the S5-95F and S5-115F.
If the connected programmable controller is to be interrogated more fre-
quently, you can reduce the value of POL. The minimum delay is 10 ms
(POL = 1).
Note that the more frequent interrogation of the connected programmable
controller results in its being subjected to a higher basic load for interface
processing.
If you do not wish to send messages from the connected programmable
controller, you can assign the value 0 to POL. The connected program-
mable controller will no longer be interrogated for messages to be sent.
Without a user-defined priority list PRI, all possible receive mailboxes (sta-
tion numbers 1 to 30, broadcast and DP connection) will be interrogated by
the CP 541 for newly received messages.
You can define the priority list yourself.
You can optimize parameter PRI as follows:
If you know which connection partners are present for the CP 541, you define
your own priority list. You can thus specify the priorities for particular con-
nection partners and from which partners a message will be transmitted.
With your self-defined priority list, you reduce the internal degree of man-
agement for the CP 541.
Communications Processor CP 541
EWA 4NEB 812 6188-02
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