Product Discription
Every digital output module
houses the circuitry for three
identical, isolated channels. Each
channel includes an I/O microprocessor which receives its
output table from the I/O communication processor on its corresponding main processor. All of
the digital output modules, except
the dual DC modules, use special
quadruplicated output circuitry
which votes on the individual
output signals just before they are
applied to the load. This voter
circuitry is based on parallelseries paths which pass power if
the drivers for channels A and B,
or channels B and C, or channels A and
C command them to close—in other
words, 2-out-of-3 drivers voted ON.
The quadruplicated voter circuitry
provides multiple redundancy for all
critical signal paths, guaranteeing
safety and maximum availability.
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