Festo Электромотор MTR-DCI - Manual (Page 180)

5. Commissioning
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Festo P.BE-MTR-DCI-DN-EN en 1209a
Sequence of parameter processing
Caution
Observe the following when modifying parameters:
An FHPP control signal, which is to refer to a modified
parameter, may only follow when the response identifier
“Parameter value transferred” is received for the relevant
parameter and if applicable for the index.
If, e.g. a position value in a position register is to be modified
and if movement is then to be made to this position, the posi-
tioning command must not be given until the MTR-DCI has
completed and confirmed the modification of the position
register.
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).