Product Discription
The analog output module receives
three tables of output values, one for
each channel from the corresponding
main processor. Each channel has its
own digital-to-analog converter (DAC).
One of the three channels is selected to
drive the analog outputs. The output is
continuously checked for correctness
by “loop-back” inputs on each point
which are read by all three microprocessors. If a fault occurs in the driving
channel, that channel is declared faulty
and a new channel is selected to drive
the field device. The designation of
“driving channel” is rotated among the
channels, so that all three channels are
tested.
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