Festo Checkbox Compact CHB-C-C Manual page 27

1. System summary
Festo P.BE-CB-COMP-EN en 0211a
Planning the size of the buffer zone
sections
Buffer zone section A
Section between conveyor device and sensor
Section A must accept all conveyed parts which
lie between the Checkbox and the sensor when
a conveyed part has been registered by the
sensor. The length depends on:
– the geometry of the conveyed parts
– the maximum transport rate of the small
parts conveyor
– the length of the transport device
Buffer zone section AB
Section between sensors 1 and 2 (only buffer
zones with 2 sensors)
Section AB determines the switching delay
(hysteresis) of the small parts conveyor for
regulating the supply of parts. The longer the
section, the less the switching frequency.
Buffer zone section B
Section between sensor and following machine
When the small parts conveyor is switched on
again, operation of the assembly plant without
interruption must be guaranteed before the first
new conveyed parts arrive.
Section B must be designed so that a sufficient
number of conveyed parts are available. The
length depends on:
– the geometry of the conveyed parts
– the maximum time delay between the small
parts conveyor being switched on again and
the availability of the new conveyed parts.
– the length and speed of the transport device
– the average number of good parts conveyed
in the nominal orientation
CBC CBC
Classic PLC
x x
- x
x x
1-11