Rockwell Automation 44N Zone Control Photoelectric Sensors - Manual (Page 2)

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System Overview
Figure 1. System Overview
ZONE 4 ZONE 3 ZONE 2 ZONE 1
P4 P3 P2 P1
Direction of Product Flow
The following section describes the general sequence of
operation of conveyors using the 44NSP Zero Pressure
Accumulation Sensor. These systems offer two modes of
accumulation that can be defined by the user: singulation
release and slug release. The loading and unloading of the
conveyor for both modes are described as follows:
Loading Product onto the Conveyor
Starting with your conveyor empty (no boxes present) and
your conveyor rollers active (running) a box placed on the
conveyor continues until it reaches the discharge zone (zone
1). As product passes through the loading zone (zone 4) a
gap will be formed equal to the zone length.
When box 1 reaches P1, zone 1 stops driving. A signal is sent
to zone 2 to indicate that zone 1 is occupied (see Figure 1).
When box 2 reaches P2, zone 2 stops driving. A signal is sent
to zone 3 to indicate that zone 2 is occupied. This sequence
is repeated until the conveyor is fully loaded
Figure 2. Loading the Conveyor
ZONE 4 ZONE 3 ZONE 2 ZONE 1
P4 P3 P2 P1
Direction of Product Flow
Unloading Product onto the Conveyor
Singulation Release
To unload box 1 from the discharge zone (zone1) activate the
zone release signal. When box 1 leaves P1, box 2 will move
to the next zone creating a gap between itself and box 3. This
sequence will be repeated until the conveyor has been
completely unloaded.
Figure 3. Singulation Release of Accumulated Product
ZONE 1 ZONE 4 ZONE 3 ZONE 2
P4 P3 P2 P1
Direction of Product Flow
Note: P1, P2, P3, P4 are used to reference 44N sensors in an
accumulation system.
Slug Release
Unloading all accumulated product can be achieved by
activating the slug release signal. This will cause all zones to
drive without singulating (separating) the boxes.
Upon de-activation of the slug release signal, the system will
resume to normal accumulation.
ZONE 1 ZONE 4 ZONE 3 ZONE 2
P4 P3 P2 P1
Figure 4. Slug Release of Accumulated Product
Direction of Product Flow
User Interface
1 0 OUT
TIMER
Output Indication
Selector Switch
Timer Adjustment Knob
(200 ms…10s)
(200 ms default setting)
Selector Switch Function
Position Description
1
Air-to-Drive. Sensor output is active (driving load) while
the reflector is unblocked. This is the factory default
setting.
0
Air-to-Break. Sensor output will be active (driving load)
while the reflector is blocked.
The on delay timer function can be used to delay the release
of product.