3. The I/O module
3-29
Festo P.BE-CB-COMP-EN en 1102d
1 Buffer zone
2 Conveyor device
3 Sensor 2
4 Sensor 1
1
2
3
4
Fig. 3/2: Buffer zone check with switching delay
Sensor type
Function
Buffer zone with one or two
sensors
Normally
open
contact
1)
Normally
closed
contact
2)
Sensor 1
LOW
Sensor 1
HIGH
The sensor does not register a
conveyed part . The small parts
conveyor is/remains switched on.
Sensor ...
3)
HIGH
Sensor ...
3)
LOW
Thebufferzoneisfull.Thedisplay
switches to “Full”. Good parts are
returned. When the preset time
has expired, the small parts c on-
veyor will be switched off; the
conveyor device still runs.
1)
Factory presetting; negative switching (NPN),
24 V DC active high
2)
To be set with CheckKon (recommendation); positive switching
(PNP), 24 V DC active low
3)
with buffer zone monitoring
– with one sensor: Sensor 1
– with two sensors: Sensor 2
Tab. 3/19: Sensor function for type NPN or PNP
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