ZPA and AS-Interface: A smart solution for controlled material flow
Achieve strictly defined distances between the conveyed unit loads with ZPA (Zero Pressure Accumulation). Thanks to a controlled material flow you can thus prevent unintentional collisions. ZPA is also energy-efficient because energy is only consumed when conveyed goods are actually being transported in the system.
Our pre-programmed ZPA solution allows you to implement zero pressure accumulation easily and cost-effectively. You benefit from autonomous and control-independent material handling. This is because there is no longer any need for centralized wiring and programming with the PLC. Other advantages include convenient, software-assisted configuration and detailed, fieldbus-independent diagnostic options.
Moreover, ZPA is compatible with all Bihl+Wiedemann ASi drive solutions – and thus with drive systems from a wide range of manufacturers.
Bihl+Wiedemann’s ZPA solution works independently of the control and drive solutions used in the system.
Via PROFINET, EtherNet/IP, Modbus, EtherCAT or POWERLINK, the ZPA solution can be connected to almost all common PLCs. All diagnostic information via ZPA is available for the PLC. Likewise, commands such as start/stop, change of directionof rotation or a global adjustment of the speed can be transmitted to the conveyor line. Switching, infeed/outfeed, barcode scanner as well as all specialties are solved with the help of the controllers on the same ASi circuit.
Individual commissioning with PC Software
1. Select hardware
ZPA-Controller (Gateway), drive modules, additional I/O modules
2. Assign parameters using the user-friendly graphical interface
Individually adjustable parameters such as speed, ramps, conveying direction, deceleration times and sensor settings; additional functions such as block removal can be activated.
3. Import and start
ZPA conﬁguration for all hardware can be imported via a single button; Live view provides diagnostic information for the running system.
Accumulation management is implemented within defined zones of the conveyor line that communicate with each other. In this process, a conveyed good is held back within a zone until the following section of the line is identified as being “free” by the logic. If the conveyed good accumulates, a signal is sent to the upstream zone, causing the material to be held back.
Zero Pressure Accumulation…
- coordinates the flow of conveyed objects between infeed and discharge points including accumulation sections and buffer zones
- guarantees that there are no “expensive” collisions or pressure on individual conveyed goods
- is energy-efficient, as drives can be temporarily switched off in conveyor lines and accumulation sections of the conveyor where there are no conveyed goods.
- ensures the highest possible and uniform utilization of conveyor lines and stations
- enables targeted accumulation of objects in the event of a temporary system fault
- ensures easier handling by creating gaps between objects