TZ Decker determines traffic regimes for the whole transfer zone (general traffic regime) and separately for rack TPs and direct TPs (partial traffic regimes). TZ Decker calculates the traffic regimes based on the TP reservation statistics for past reservations and predicted reservation times for the future. For the different traffic regimes, TZ Decker considers TP occupancy per hour and the ratio of occupied versus non-occupied time for the TPs.
The traffic regimes are:
Light: Traffic is light and TP occupancy is typically low, therefore spacial policies dominate. In this case, TZ Decker typically decks new dispatches to idle TPs without impacting existing TP reservations.
Medium: Traffic and TP occupancy is moderate. In this case, TZ Decker may override the preferred transfer type and can evict parked AGVs to avoid congestion build up.
Heavy: Traffic and TP occupancy is high. In this case, TZ Decker can intelligently double deck TPs, such as when the remaining duration of a TP reservation is short, and can pre-position AGVs in a nearby parallel buffer for double-decked TPs.
During heavy traffic, TZ Decker also considers the job urgency of decking requests. It computes job urgency based on the reservation time window, the time it has already been failing dispatch, and if it is a partial work assignment (WA) package (that is only AGVs or only ASCs) or a full WA package (that is both AGVs and ASCs). The job urgency can be urgent, semi, or non-urgent. The urgency of the job being decked and the urgency of the job that is occupying the lane both determine the behavior of TZ Decker. You can configure this behavior via matrix-based urgency multiplier parameters that are defined in the system-seeded code extension BaseTZDeckerParamsProvider.
TZ Decker makes decking decisions based on the penalties and the TZ Decker penalties depend on the current traffic regimes and other parameters, such as the move kind, inbound or outbound direction, and single or twin. Some TZ Decker penalties depend on the partial traffic regime, some on the general traffic regime, and some on both. For more information, see Configure TZ Decker penalties (on page 1).