1. S ystem summary
1-9
Festo P.BE-CB-COMP-EN en 1102d
1.5 Buffer zone
The buffer zone serves as a parts buffer for the next machine
e.g. an assembly system.
The Checkbox can monitor the highest and lowest filling
states of the buffer zone and if the jam of parts is long, it can
switch the small parts conveyor on or off as required.
(Buffer zone check, see Fig. 1/2).
Additionall y by means of a second sensor, the small parts
conveyor can be switched to delay . (Buffer zone check with
hysteresis, see Fig. 1/3).
Signal delay
The buffer zone inputs are processed by the Checkbox with a
debounce time. The sensor signal is only evaluated if it is
present for at least 1 second. This delay prevents each con-
veyed par t from triggering the signal “Buffer zone full” when
it passes the sensor.
The delay time of 1 second between the registering of a con-
veyed part by the sensor and the interpretation of the signal
by the Checkbox must be taken into account when the buffer
zone sections are planned.
Planning the size of the buffer zone
Thebufferzonesections(seeFig.1/2)mustbedimensioned
so that uninterrupted operation of the machine is possible.
Instructions on dimensioning the buffer zone can be found in
the following table.
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