Festo Контроллеры двигателя SFC-LAC - Manual (Page 232)

B. Parametrising as per FHPP−FPC
B−4
Festo GDCP−SFC−LACI−CO−EN en 0812NH
Notes on representing the finite state machine:
The transition T3 changes to state S4, which itself contains its
own sub−state machine, the states of which are marked with
SAx" and the transitions of that are marked with TAx". This
enables an equivalent circuit diagram to be used, in which the
internal states SAx are omitted:
Switched off
S1 Controller
switched on
S3 Drive enabled
S2 Drive disabled
S5 Reaction to
faults
S6 Malfunction
From all statuses
Operation
enabled
T6
T2
T5
T3
T4
T1
T7*
T8
T10
T9
S5
T11
S4
Fig. B/2: Finite state machine equivalent circuit diagram
Transitions T4, T6 and T7* are executed from every sub−state
SAx and automatically have a higher priority than any transiĆ
tion TAx. Such a structure is a simplification. It is not thereĆ
fore necessary to define out of each SAx state a separate
transition as per S3 for the reaction to STOP (S3: Drive is conĆ
trolled).
Reaction to faults
T7 (Fault recognised") has the highest priority and receives
the asterisk *".
T7 is then derived from S5 and S6 when an error of higher
priority occurs. As a result, a serious error can displace a
slight error.