10
SP
rP
Fig. 2: Hysteresis function
SP: Set point
rP:
Reset point
HY: Hysteresis
Hno: Hysteresis function NO (normally
open)
Hnc: Hysteresis function NC (normally
closed)
t:
Time
When the hysteresis function is set, the set point [SP] and the reset point
[rP] are defined. The rP value must be lower than the SP value. The
distance between SP and rP is at least 4 % of the final value of the
measuring range (= hysteresis). If only the set point is changed, the reset
point is changed automatically; the difference remains constant.
FL
FH
Fig. 3: Window function
FH: Upper limit value
FL:
Lower limit value
HY: Hysteresis
FE: Window
Fno: Window function NO (normally open)
Fnc: Window function NC (normally
closed)
t:
Time
