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The Box, the Rules and the Safety Twin: the Rest of IEC 61131 and PLCopen
A brand-new remote I/O cabinet at the Al Sahil Gas Complex keeps registering phantom pulses from a proximity switch, and a packaged-skid vendor insists its safety PLC is "certified to 61131" as if that settled the matter. Rafa Ortega, the commissioning manager, and Mariam Al Hosani, the operator's functional safety lead, spend a week untangling the less famous parts of IEC 61131: the hardware rules in part 2, the functional safety PLC requirements in part 6, the programming guidelines in part 8, and the industry group, PLCopen, that fills the gaps the IEC leaves. Along the way: why a digital…
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