Abstract
In the field of production automation, IO-Link Wireless (IOLW) offers energy-efficient and cost-effective solutions for networking wireless sensors and actuators close to the machines on the industrial shop-floor. In this paper, a concept is presented to enhance IOLW with security-for-safety and safety features in order to make safety critical systems in industrial environments with performance characteristics dedicated to demanding applications feasible. As data security is of paramount importance, security mechanisms already implemented in other wireless protocols are investigated and security-for-safety mechanisms for IOLW are introduced. Potential cryptographic algorithms are evaluated for IOLW with respect to energy consumption and timing. Taking performance parameters into account, which are crucial for industrial manufacturing processes, a safety protocol data unit (SPDU) is described and evaluated for different payload length and cycle times. Finally, an outlook towards the implementation of a demonstrator setup completes this work.
Highlights
To enhance the IO-Link Wireless (IOLW) protocol towards a robust and secure safety protocol in a cyber-physical system (CPS), it is mandatory to provide highly deterministic data exchange functionalities
As data security is of paramount importance, security mechanisms already implemented in other wireless protocols are investigated and security-for-safety mechanisms for IOLW are introduced
Taking performance parameters into account, which are crucial for industrial manufacturing processes, a safety protocol data unit (SPDU) is described and evaluated for different payload length and cycle times
Summary
To enhance the IO-Link Wireless (IOLW) protocol towards a robust and secure safety protocol in a cyber-physical system (CPS), it is mandatory to provide highly deterministic data exchange functionalities. The use of a wireless standard for applications in the field of functional safety with ensured latency times in the order of 10 ms as safety critical communication still remains a major technical challenge that none of the aforementioned technologies has yet fully met. These preliminary considerations create the basis to specify prerequisites for demanding safety applications. The paper ends with a summary of the main ideas and results
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