Festo Контроллеры двигателя SFC-LAC User Manual Page 240

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B. Parametrizing via field bus
B−20
Festo GDCP−SFCLACIDN−EN en 0812NH
B.2.3 Rules for job reply processing
Rules Description
1 If the master sends the identifier for No Task", the SFCLACI replies with the response
identifier for No Reply"
2 A job or reply telegram always refers to a single parameter
3 The master must continue to send a task until it receives the appropriate reply from the
SFCLACI
4 The master recognises the reply to the job placed:
by evaluating the response identifier
by evaluating the parameter number (PNU)
if applicable, by evaluating the subindex (IND)
If applicable, by evaluating the parameter value
5 The SFCLACI provides the reply until the master sends a new task
6 a) A write task, even with cyclic repetition of the same task, will only be carried out once
by the SFCLACI.
b) Between two consecutive jobs with the same Job identifier (AK), parameter number
(PNU) and subindex (IND), the Job identifier 0 (no job) must be sent and the Response
identifier 0 (no reply) must be awaited. This ensures that an old" reply is not inter
preted as a new" reply.
Tab.B/8:Rules for job reply processing
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