S5-90U/S5-95U
Integrated Blocks and Their Functions
9.4.5 How to Recognize and Correct Parameter Errors
If the PLC detects a parameter error in DB1, it will enter the STOP mode even after a transition
from STOP to RUN, i.e. the red LED lights up.
There are two ways of analyzing parameter errors:
•
By means of a parameter error code
oder
•
By means of the ”ISTACK” analysis function.
Both possibilities are described below.
Interrogating the Parameter Error Code
In order to facilitate the detection and elimination of parameter errors, the PLC offers the possibility
of displaying error messages in coded form. The PLC need only be "told" where it is to store the
error code. This must be specified in the parameter block "ERT:" of DB1.
The error code can be written into
•
Flag words, flag bytes
or
•
Data words of a data block.
The complete error code takes up 20 flag bytes or 10 data words. Only the start address for the
error code must be specified in parameter block "ERT:".
If you have specified a start ID for the parameter error code in parameter block "ERT:" of DB1, you
can refer to this address for interrogating the cause and location of the error.
Correct entry of the parameter block "ERT:" considerably facilitates the elimination of parameter
errors. It is therefore recommended that this block of DB1 be completed before modifying or adding
any other parameters.
Since this parameter block is only important in the start-up phase, it should be deleted before
starting "normal" operation in order to save memory space.
If you do not specify any parameter block "ERT:" in DB1, you can locate the error in the ISTACK in
the event of a parameterization error but you get no information on the type of error. The same
applies if you have made an error when making the settings in parameter block "ERT:".
EWA 4NEB 812 6115-02b
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