The switching mode of the binary outputs A and B can be determined as threshold value or window
comparators
è
–
Threshold value comparator: SP
A2
or SP
B2
= 0
–
Window comparator: SP
A2
or SP
B2
> SP
A1
or SP
B1
If the air saving function is active, the binary outputs can only be configured as a threshold value com-
parator.
Threshold value comparator
Switching function:
–
1 switching point (SP
A1
, SP
B1
)
Tab. 4 Threshold value comparator
Window comparator
Switching function:
–
2 switching points (SP
A1
, SP
B1
und SP
A2
,
SP
B2
)
Tab. 5 Window comparator
4.4
Vacuum generation
The vacuum is generated by the Venturi principle using the vacuum generator cartridges. For sizes -20
and -30, two vacuum generator cartridges are connected in parallel to generate the vacuum; for size
-14, one channel is closed with a blanking plug.
4.5
Control of the vacuum function
Vacuum generation is activated when the output signal (output bit "Vacuum generation") is present
for at least 50 ms. Since the vacuum generation is pulse-controlled, vacuum is also generated after
deactivation of the output signal.
Function
10
Festo — VABF-S4-...-CB-VH/VL-... — 2019-05