Siemens SIMATIC NET Guide de l'utilisateur télécharger pdf (Page 16)

12 Wonderware Siemens SIMATIC NET S7 I/O Server

With this 3 radio buttons you are able to tune the poking behaviour to the PLC. The 3

modes behave as follows.

Control mode: This mode makes no folding of write values. This should be selected

when using this topic with control clients like InBatch and InControl. If selected the

server processes all poked values in the order they are received from a client and makes

no folding of poke values.

Transition mode: This mode implements poke optimization except the server receives

more than one value per item in one timeslice. If this happens only the first, the second

and the last value is poked. This is the default selection and preserves InTouch sliders

from stuttering.

Full optimization: This mode tells the server that he should build poke messages

regardless of folding and poke order aspects.

Note The highest performance can be achieved with the Full optimization mode. But if

you must be aware of the poke order and that no intermediate poke value is lost you

have to choose the Control mode.

Choose one of these buttons to configure which optimization mode the server should use

to get data from the PLC.

By default, the Auto mode is best to use when exploiting the whole PDU. The Auto

mode should have the best performance in cases where you are not making too many

activations and deactivations.

The Block read mode always registers a whole byte array containing some items. If you

frequently switch items (activating and deactivating) that have similar addresses, this

would be the best selection. In this mode, there are less activations and deactivations on

the protocol.

The S7 SAPI mode is the same optimization mode used in the pre-release of the former

S7 server. This mode has been implemented to keep the server compatible to the former

server. This should be the less preferred optimization mode.

If you know how many services the remote PLC could handle this dialog box limits the

use of cyclic services in this topic and can distribute the available cyclic services among

the topics associated with this connection.

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Siemens SIMATIC NET Guide de l'utilisateur Page 16