18 August 1998
(2) Applications software monitors and controls the utility systems and equipment connected to
the field equipment panel and exchanges data with other field equipment panels and with the island
b. The field equipment panel uses stored operational data, measurements from local instruments
and time of day to execute applications programs. Software generated values must be checked against
field equipment panel stored constraints to prevent equipment damage due to improper commands. In
the event that software generated values exceed the constraints, the stored constraint values must
prevent issuance of that command.
c. Field equipment panel system software must be capable of detecting hardware and software
failures and forcing all outputs to a predetermined state, consistent with the failure mode requirements
defined on the drawings.