Software function blocks Pallet dispenser PD1 - SIEMENS
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4.4
De-stacking with Pallet dispenser PD1
De-stacking configuration has 3 options for output of pallets.
Pallets are always loaded in depot though option (2)
De-stacking has two starting position, dependent of mode selection in settings;
Mode selection;
1.
Basic position; Upper position B1 and forks in pallet stack B5
(Pallet stack in forks)
2.
Wait position; Bottom position B3 and forks out of pallet stack B13
(Pallet stack on pallet conveyor)
From the configured starting position, a single pallet can be requested through command ‘Deliver’,
this start the deliver cycle. The cycle is completed when the Pallet dispenser is at upper position (B1)
and forks in pallet stack (B5) and sensor B7 detects a pallet.
The pallet dispenser gives the status ‘Pallet Present’ to signal a new pallet is ready to transport.
Transport can be started if status ‘Basic position’ is active
If mode 1 is used the depot will wait until receiving a new command “Deliver’ is given and B7 is
unblocked.
When using mode 2 the depot will move to wait position after B7 is unblocked and receiving
command ‘Wait position’
Pallet depot is empty after not detecting a pallet (B7) after the cycle reached bottom position (B3)
and the forks are out of the pallet (B13) or when the depot reaches upper position (B1) and forks in
pallet stack (B5)
Pallet depot is almost empty when sensor B8 is free for certain amount of time.
CAUTION
Sensor B7 must be correctly aligned!
This sensor must be able to detect a pallet in every situation!
