Wireless Communication for Sensors and Actuators
PI (PROFIBUS & PROFINET International) has defined the upcoming work for wireless coupling of sensors and actuators in factory automation. Based on preliminary investigations, PI has decided to use radio technology compliant with IEEE 802.15.1 for manufacturing automation.
The investigations showed that a series of different requirements exist for coupling sensors and actuators in factory and process automation. On the one hand, performance requirements differ, and on the other, the standardized protocols for HART sensors and actuators (for process automation) and IO-Link (for manufacturing automation) are optimized to the respective requirements. WirelessHART uses radio technology compliant with the IEEE 802.15.4 standard for the transmission technology. Due to the higher requirements regarding response time, radio technology compliant with IEEE 802.15.1 will be used for manufacturing automation.
PI has already decided for WirelessHART as the standard for process automation one years ago. To be able to offer an optimum solution for factory automation, PI decided to develop the specification for wireless sensors and actuators for factory automation based on WISA technology (IEEE 802.15.1).
The question of coexistence is especially important. In addition to coexistence with WirelessHART, it must also be guaranteed with WLAN, the standard for wireless transmission in PROFINET systems. This is ensured by making corresponding settings in the wireless sensor networks for process and manufacturing automation.
The specification work for the wireless communication of sensors and actuators in manufacturing automation has already begun. The target for completion of the corresponding documents is 2009.
Alternative and integrated uses of the radio technology for process automation (IEEE 802.15.4) and factory automation are being left open for the future by PI.