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Slide 9
InstMC FS2016 V1.3
Nicol Instrument Engineering Limited
Clarifies
Limits for BPCS protection layers not to IEC
61511
DCS/ Controller 1
S1
Each BPCS PL shall be independent and separate from
the initiating source, and each other.
DCS/ Controller 2
S2
Fails
DCS/ Controller 1
S1
DCS/ Controller 2
S2
Non
BPCS
Failure