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How do Target Crane Infeed and Outfeed work
Skill required to complete this article: Cranes ~ Minload Cranes and level is Intermediate.

  • The trays moving into the crane triggers an ACP at the Pre-HOP position and the TU then continues into crane pickup after the receipt of an ARQ from AM. The 1st tray will move forward towards the crane and wait for the 2nd tray to pair up with. When the 2nd tray has arrived at the pre-hop, the ACP for both positions is sent to AM. In a case where the 2nd tray never arrives (no read); there is a timeout from AM that triggers an ARQ message that will break the pair.

  • Trays within a pair must be diverted to their crane aisle in a specific sequence defined by AM.

  • Inbound HOP zone 1 is always on the crane side.

  • A single large tray will only trigger the ACP (Assignment Completed) and POR0 (Position Occupied Report) for the 2nd tray position.

  • When the crane drops off trays, the deposit position sends one POR0 telegrams for when the position is cleared.

  • At the pick and deposit positions there are overhang photo eyes that oversee the trays and prevent them from over traveling and falling into the crane aisle. If the overhang photo eye is triggered while an item is supposedly staged then the area is considered jammed and will require manual intervention. An alarm will be posted and local amber colored beacons will light if the area is jammed.

  • For crane in feed HOPs situated on the right hand side of the crane (looking into the crane aisle from the crane loop); an additional ARQ/ACP exchange is required when moving the first of pair from the Zone 1 position to the Zone 2 position of the HOP on arrival of the second of pair at the Pre-HOP

  • The handshaking between the conveyor and the cranes are done with interlocked I/O with the P&F data coupler.

  • A DP Coupler is used to send the crane a “Stop” command if the Inbound or Outbound crane aisle eye is jammed.  The coupler consists of 1 output per crane.  This bit will be turned ON if a fault is present.


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 Article Info
 Article ID:  KB-10895
 Published on  4/19/2019
 Last Modified on  4/19/2019
 Last Modified by  David Peery
 Original URL:
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