Festo Электромотор MTR-DCI - Manual (Page 215)

B. Supplementary information
B-9
Festo P.BE-MTR-DCI-PB-EN en 1209a
Sequence of parameter processing
Caution
Observe the following when modifying parameters:
An FHPP write request referring to a modified parameter
may only be sent once the response identifier “Parameter
value transferred” is received for the relevant parameter
and (where applicable) index.
If for example you want to modify a position value in a posi-
tion set table and then have the drive move to that position,
the positioning command can only be given when the MTR-
DCI has completed and confirmed the modification of the
position set table.
Caution
In order to be sure that an “old” response cannot be inter-
preted as a “new” response, the request identifier 0 (no
request) must be sent and the response identifier 0 (no
response) must then be received between two consecutive
requests with the same request identifier (AK), parameter
number (PNU) and subindex (IND).
Fault evaluation
In the case of requests which cannot be carried out, the slave
responds as follows:
– Output of response identifier = 7
– Output of a fault number in bytes 7 and 8 of the para-
meter channel (FPC)