Datasensing SH4 ADVANCED Product Reference Manual page 88

FUNCTIONS
Then, an override request is accepted only if signals at OVERRIDE inputs follow the tim-
ings shown below.
Two types of override trigger sequence are accepted on external inputs:
•
OVERRIDE 1
OVERRIDE 2
MUTING1 or
MUTING2
OVERRIDE STATE
•
OVERRIDE 1
OVERRIDE 2
MUTING1 or
MUTING2
OVERRIDE STATE
80
SH4 ADVANCED
Level Trigger: override engaged until both contacts are closed and at least one
muting sensor is intercepted (high input).
Figure 59: Level Triggered Override Timings
Edge Trigger: override engaged on contacts closing until at least one muting sen-
sor is intercepted.
Figure 60: Edge Triggered Override Timings
t < T
out
t < 400ms t < 400ms
t < T
out
t < 400ms
24Vdc
Open
Open
0Vdc
TRUE
FALSE
NORMAL OPERATION
SAFE STATE
24Vdc
0Vdc
24Vdc
0Vdc
TRUE
FALSE
NORMAL OPERATION
SAFE STATE