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Project requirement for a Turbo compressor system specifies a SIL certified PLC, but supplier is refusing to comply to the SIL certification requirements.
Supplier is saying that PLC I/O cards, controller are certified to use in a SIL certified PLC, but they are refusing to supply the PLC as SIL certified. The reason for that, I presume, is that they might not be following all the requirements mentioned under safety manual of the certified PLC.
Under this scenario, from where do we get the failure rates of PLC? That is, does the manual specify failure rate, if safety manual instructions are followed completely as well as if not followed?
Is it the scenario for most of the machinery suppliers? Is it due to avoid any design change which they have been following years together?
Appreciate SIL experts feedback, thanks.
Regards,
GB
Supplier is saying that PLC I/O cards, controller are certified to use in a SIL certified PLC, but they are refusing to supply the PLC as SIL certified. The reason for that, I presume, is that they might not be following all the requirements mentioned under safety manual of the certified PLC.
Under this scenario, from where do we get the failure rates of PLC? That is, does the manual specify failure rate, if safety manual instructions are followed completely as well as if not followed?
Is it the scenario for most of the machinery suppliers? Is it due to avoid any design change which they have been following years together?
Appreciate SIL experts feedback, thanks.
Regards,
GB