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I'm trying to find a commercial PLC or PAC that will support multiple programs at different safety levels executing on a single processor.
More specifically, what I need is a PLC or PAC whose run-time operating system guarantees that any failure resulting from a defect in a program operating at a lower safety level can not, under any circumstance, disrupt the operation of the higher safety level functions.
I know there are various RTOSes out there that claim to support such a design for embedded processing (e.g. Green Hills Integrity -178B), but we typically use PLCs in our control system designs, so I'm hoping to find a PLC (or similar) that supports this.
Does anybody know of any PLCs or PACs that support this?
More specifically, what I need is a PLC or PAC whose run-time operating system guarantees that any failure resulting from a defect in a program operating at a lower safety level can not, under any circumstance, disrupt the operation of the higher safety level functions.
I know there are various RTOSes out there that claim to support such a design for embedded processing (e.g. Green Hills Integrity -178B), but we typically use PLCs in our control system designs, so I'm hoping to find a PLC (or similar) that supports this.
Does anybody know of any PLCs or PACs that support this?