Emerson Epsilon Eb Series Reference Manual page 90

Setting Up Parameters
Active Off Check Box
The default active state of an output line is "Active On". This means that the output line will
supply a voltage when the result of the logical OR of the output function(s) assigned to that
output line is active.
Making an output line "Active Off" means that the line will be "Off" (not conducting) when
the result of the logical OR of the output function(s) assigned to that output line is active, and
will supply a voltage when the logical OR of the output function(s) is not active.
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