Festo Кабели и принадлежности - Manual (Page 110)

5. Parameter channel
5−10
Festo P.BE−SPC200−COM−PDP−E N en 0901c
Please note
In order to be sure that an old" reply is not interpreted as
a new" reply, the task identifier 0 (no task) must be sent
and the reply identifier 0 (no reply) must be expected beĆ
tween two consecutive tasks with the same task identifier
(AK), parameter number (PNU) and subindex (IND).
Evaluating faults
In the case of tasks which cannot be carried out, the slave
replies as follows:
ć Output reply identifier = 7
ć Output a fault number in bytes 7 and 8 of the parameter
channel