
27
Fig. 8. Alarm types: a, b - normal, c - switched off, d - switched on
State
of
contacts
PrL
PrH
1 - Relay switched on
0 - Relay switched off
Measured value
0
1
0
1
1 - Relay switched on
0 - Relay switched off
Measured value
State
of
contacts
PrH
PrL
0
1
1 - Relay switched on
0 - Relay switched off
Measured value
State
of
contacts
PrL
PrH
0
1
1 - Relay switched on
0 - Relay switched off
Measured value
State
of
contacts
PrL
PrH
a) nor (PrH > PrL)
b) nor (PrH < PrL)
c) OFF
d) On