User Manual

B. Parametrizing via field bus
B−21
Festo GDCP−SFC−LACI−DN−EN en 0812NH
Sequence of parameter processing
Caution
Observe the following when modifying parameters:
An F HPP write signal referring to a modified parameter
may only occur when the Response i
dentifier Parameter
value transferred" is received for the relevant parameter
and if applicable for the index.
If, for example,a position value in a
position set table is to be
modified and if movement is then to be made to this position,
the positioning command must not be given until the
SFC−LACI has completed the modification of the position
register and confirmed this.
Caution
In order to be sure that an old" reply cannot be inter
preted as a new" reply, the Job identifier 0 (no job) must
be sent and the
Response identifier 0 (no reply) must be
awaited between two consecutive jobs with the same job
identifier (AK), parameter number (PNU) and subi
ndex
(IND).
Evaluating errors
In the case of jobs which cannot be carried out, the slave
replies as follows:
 Output of response identifier = 7
 Output an error number in bytes 7
and 8 of the parameter
channel (FPC).