PLC/PAC with Secure Partitioning
PLC/PAC with Secure Partitioning
(OP)
I'm trying to find a commercial PLC or PAC that will support multiple programs at different safety levels to execute on a single processor.
That is, I'm looking for a run-time systems which 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 (e.g. Green Hills Integrity -178B) for embedded processing, 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?
That is, I'm looking for a run-time systems which 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 (e.g. Green Hills Integrity -178B) for embedded processing, 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?





RE: PLC/PAC with Secure Partitioning
RE: PLC/PAC with Secure Partitioning
Generally speaking, most PLCs only support one single executable program. That program may have many different independent parts, and in some cases the various parts be executed asynchronisly of one another. However a fault in one part of the program, if not caught, will cause the processor to fault stopping all programs.
The features you are looking for probably only exist on higher level controllers such as soft PLCs or controllers.
RE: PLC/PAC with Secure Partitioning
Simatic Safety Systems
"If I had eight hours to chop down a tree, I'd spend six sharpening my axe." -- Abraham Lincoln
For the best use of Eng-Tips, please click here -> FAQ731-376: Eng-Tips.com Forum Policies