100
90
80
70
60
50
40
30
20
10
0 10 20 30 40 50 60 70 80
90 100
t
Off N.O.
Off N.O.
On N.O.
On N.C.
On N.C.
Off N.C.
100
90
80
70
60
50
40
30
20
10
t
Off N.O.
Off N.O.
On N.O.
On N.C.
On N.C.
Off N.C.
t
Off
Off
Off
1
1
2
2
On
On
On
t
Off
Off
Off
1
1
2
2
On
On
On
Section 20.3 - Graphic of relay action setpoint
Relay units
Relay units
Setpoint = 50
Hysteresis = 10
Hysteresis = 10
Setpoint = 50
Relay action: Increasing
Relay action: Decreasing
Relay units
Setpoint High = 60
Hysteresis = 5
Hysteresis = 5
Setpoint Low = 40
Relay function: Window (shown for increasing signal)
Contact: Closed inside window =
Contact: Open inside window =
Relay units
Setpoint High = 60
Hysteresis = 5
Hysteresis = 5
Setpoint Low = 40
Relay function: Window (shown for decreasing signal)
Contact: Closed inside window =
Contact: Open inside window =
1
2
1
2
Graphic Depication of Latch
20
36
0 10 20 30 40 50 60 70 80
90 100
100
90
80
70
60
50
40
30
20
10
100
90
80
70
60
50
40
30
20
10
0 10 20 30 40 50 60 70 80
90 100
0 10 20 30 40 50 60 70 80
90 100
Section 20.4 - Graphic depiction of relay action window