6-11
FUNCTION
DESCRIPTION
Upper-limit Action
Lower-limit Action
Outside-the-range
Action
6-5 Comparative Output
6-5 Comparative Output
Comparative outputs 1 and 2 can be produced as three types of signal actions: upper-
limit signal action, lower-limit signal action, and outside-the-range signal action.
Comparative output turns on
when the process value
reaches the OUT set value.
Comparative output turns off
when the process value
decreases to (OUT set value -
hysteresis).
Comparative output turns on
when the process value
decreases to the OUT set
value.
Comparative output turns off
when the process value
reaches (OUT set value +
hysteresis).
Comparative output turns on
when the process value
reaches the OUT upper-limit
value or decreases to the OUT
lower-limit value.
Comparative output turns off
when the process value falls
inside the range of (OUT
upper-limit value - hysteresis)
to (OUT lower limit value +
hysteresis).
Combinations of comparative output 1 and 2 offer the possibility of producing a wide
variety of actions including upper-limit + another upper-limit actions, lower-limit +
another lower-limit actions, and two-level outside-the-range actions.