Plant Management
With the SILworX engineering tool, two-level user management with configurable access rights protects the project as well as the safety system. Source: HIMA Paul Hildebrandt.
protection with a virtual or physical separation can be set up for the communication. The HIMax CPU module executes the safety application and can handle communication tasks. Both areas are separated on the CPU through SIL3-certified protection of the memory and of the timing between the communications and safety areas. If an insecure data transmission
is directly connected on the CPU, an integrated firewall ensures a virtual separation because only the protocols and data configured by the user are supported. Invalid or unknown protocol queries or read/write of non-configured address ranges are simply ignored by the controller. For further risk reduction a physically
separated communications module can be used. The module has the same security firewall characteristics as the processor module and is connected to the CPU only via the internal system bus. Because the communications module cannot influence the CPU the safe function is physically separated from the non-secure communication. These features result in stable,
robust system behaviour. HIMA incorporates cybersecurity measures in
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its product development right from the start. This includes the Achilles test procedure from Wurldtech, with which constantly updated tests are executed in the development of all new products.
safety system must have a variety of security features to harden it against safety-security risks or to reduce the risk in plants.
A
The Achilles test is recognised internationally for verification of industrial cybersecurity and includes a simulation of cyber attacks. In these tests, the processor module and the communications module of HIMax have proven their resistance to cyber attacks and have received the Achilles Level 1 certificate.
Conclusion Put simply, there is no safety without security. If a security risk exists via interfaces or integration, the integrity of functional safety is in jeopardy. Security deserves this same high level of attention that is devoted to the topic of safety. n
Stefan Ditting and Thomas Janzer are product managers with HIMA Paul Hildebrandt, based in Brühl, Germany.
www.hima.com
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