A 4WPS Personal Protection Unit (PPU) is a small electronic device carried by staff around a worksite. The device uses a radio signal to provide continuous monitoring of the worker’s location to the site Master Control Unit. It can also receive alarms from the site Master Control Unit or a Secondary Control Unit.
The device uses a ZigBee Personal Area Network as its core technology to allow small, low-power digital radios based on an IEEE 802.15.4 standard to be configured for site use. The PPU device uses a mesh network structure to transmit data over longer distances, passing data through intermediate devices such as other PPUs, a MCU or SCU to reach more distant ones. This allows ad-hoc worksite protection networks to be formed, with no centralised control or high-power transmitter/receiver able to reach all of the devices by the one radio signal.
- Built around industry-standard ZigBee IEEE 802.15.4 for Personal Area Networking
- Always-on monitoring of data
- Monitoring of many parameters
- Automatic alarm reporting
- Use of a 4WPS server as the host processor