Custom scripting as a potential safety hazard

Most users don’t consider custom scripting as a potential hazard or safety concern because custom scripting allows users great flexibility in human-machine interface (HMI) development. However, this flexibility can come with a copious price tag. The question most users need to ask themselves is: just because custom scripting is available in the HMI display environment, should it be used in this scenario? Users migrating from any legacy system should ask themselves a different question: what are the benefits of custom scripting? Quite often, custom script development in legacy systems is a requirement that is superseded in newer HMI development programs. The HMI development software for a newer distributed control system (DCS) has much greater functionality today than in legacy systems. There are several potential


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