Operation Manual EMGZ 490
15.12.2015
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7.3
Limitations
In order for the EMGZ490 to not reach system limitations, one should avoid the use of
some services during operation. These services are:
•
Port scanning
•
Web services
•
Stress tests
•
As well as all other not-PROFINET related services and protocols
•
The use of ring topology is not permitted.
Caution
During operation the use of not-PROFINET related services and protocols should be
avoided. There is the possibility of a system overload, if such a service is nonetheless
used. The consequence is a connection interruption between EMGZ490 and PLC. The
interruption usually lasts between 3-5 seconds. Afterwards, a new connection is
automatically established again.
7.4
Functional Blocks, Example
Three functional blocks (FB1, FB2, FB3) were configured. These FBs were loaded to the
controller
Name
Description
Function
FB1 FMS_READ_FB
Reads a data package from the
specified slot and index
FB2
FMS_WRITE_FB
Writes a data package from the
specified slot and index
FB3 FMS_CYCLIC_FB
Reads cyclic data and writes it to a DB
The functional blocks are fetched cyclically, and if a read or write-instruction is required,
it is carried out. In PROFINET usually the organisational block OB1 is used, which is
fetched once every cycle. The sequence of function calls is shown in the following
diagram
:
