Siemens S7-200PLC Manual de usuario descargar pdf (Pagina 8)

Implementation steps

Chapter 5.

4. B. For an eWON with MPI port, the configuration fields are slightly different. You have to

select the protocol PPI MULTIMASTER. As the MPI port configuration is shared by the S7-200

and the S73&400 IO Servers, this combo box shows also the MPI & Profibus protocols BUT they

won't work with an S7-200. PPI MultiMaster and MPI/Profibus are mutually exclusive. It is not

possible to use the S7-200 and the S73&400 IO Servers on the MPI port at the same time.

5. To be able to poll data registers out of your PLC, you need to define and enable at least one

Topic in the lower part of the IO Server configuration page. Topics are meant to allocate common

properties to a group of tags (properties include Enable/Disable, Global Device Address, and

Poll Rate).

The snapshot below shows 2 topics enabled/configured.

Note: You might conclude the eWON cannot connect to more than 3 PLCs from the

fact there are 3 topics (A, B and C). If you need to poll tags on more than 3 PLCs,

refer to the Knowledge Base page of our Wiki here:

http://wiki.ewon.biz/Support/06_Knowledge_Base/

type How to reach more than 3 PLCs in the search field.

6. In Poll Rate, you can define the refresh rate in ms (milliseconds) applicable to all data

registers that will be included in this topic. If you leave this field blank, the default value applied

will be 2000 ms (2 seconds). The polling rate specified here applies to all tags associated with this

topic. If you have tags that need to be refreshed at a different rate, enable and configure multiple

topics.

Polling Data Registers from Siemens S7-200 PLC Series (How to) Page 8/21

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Siemens S7-200PLC Manual de usuario Pagina 8