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FM 351 Positioning Function Module
EWA 4NEB 720 6001-02
Irrespective of their specific task, all FCs read the check-back signals from
the FM 351 (for example, the momentary actual value). The read values are
then entered by the relevant FC in the channel DB.
Note
The read values give the status which the FM351 had before the call (for
example, the actual value before the call setting the reference point).
All FCs affect the binary result BIE.
BIE=1: The data transfer has been terminated without any errors.
BIE=0: The data transfer has been terminated with an error.
In the case of an error (BIE=0) the parameter RET_VAL provides further
information.
In all of the FCs parameters are set which are identical in name and effect.
They are therefore only comprehensively explained once. With the separate
FCs they are only explained in the list with a brief key word.
Name Data Type P Type Meaning
DB_NO BLOCK_DB I Channel DB number for the current FM 351;
Only one channel DB is present per FM 351 channel. All parameters are
deposited in it.
RET_VAL INT O Return code of the SFC WR_REC;
All writing FCs use the SFC WR_REC for transferring the data. If an error
has occurred during transfer (BIE=0), you can evaluate the parameter
RET_VAL.
Read the reference manual System Software for the S7-300 and S7-400,
System and Standard Functions, Chapter 2 for how you can evaluate the
parameters.
DATA_ERR BOOL O Data error;
If the FM 351 detects a data error during the checking of the transferred
data, the parameter is set. You can analyze the error more precisely via the
parameterization interface.
IN_**** BOOL I/O By setting the parameter you inform the FC, that a data transfer is to be
started.
When the FC starts the data transfer, the FM 351 resets this parameter.
For each FC the **** must be substituted by the specific designation.
TRUE - The transfer is enabled.
FALSE - The parameter is reset by the FC when the job has been car-
ried out without error.
Task of all FCs
Binary Result BIE
Parameters
Programming the FM 351
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