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
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
0 10 20 30 40 50 60 70 80 90 100
t
Off OffOff
1 1
2 2
OnOn On
100
90
80
70
60
50
40
30
20
10
0 10 20 30 40 50 60 70 80 90 100
t
Off OffOff
1 1
2 2
OnOn On
28
Graphic depiction of relay action Setpoint
Graphic depiction of relay action Window
Relay unitsRelay units
Setpoint=50
Hysteresis=10
Hysteresis=10
Setpoint=50
Relay action: Increasing Relay action: Decreasing
Relay units
SetpointHigh=60
Hysteresis=5
Hysteresis=5
SetpointLow=40
Relay function: Window (shown for increasing signal)
Contact:Closedinsidewindow=
Contact:Openinsidewindow=
Relay units
SetpointHigh=60
Hysteresis=5
Hysteresis=5
SetpointLow=40
Relay function: Window (shown for decreasing signal)
Contact:Closedinsidewindow=
Contact:Openinsidewindow=
1
2
1
2