SFAW
Festo – SFAW – 1602a English
9
2.2
Switching outputs
2.2.1
Switching functions
Threshold value comparator in the flow measurement for OutA or OutD and in the temperature meas
urement for OutB
Function
NO (normally open)
NC (normally closed)
Switching function:
–
1 switching point (SP)
TEACH mode
1)
:
–
2 teach-in points (TP1,
TP2)
–
SP = ½ (TP1+TP2)
Q
1
0
HY
OUT
SP
TP1
TP2
Q
1
0
SP
HY
OUT
TP1
TP2
1)
Only with flow measurement
Tab. 3
Threshold value comparator: setting of switching point SP and hysteresis HY
Window comparator in the flow measurement for OutA or OutD and in the temperature measurement
for OutB
Function
NO (normally open)
NC (normally closed)
Switching function:
–
2 switching points
(SP.Lo, SP.Hi)
TEACH mode
1)2)
:
–
2 teach-in points (TP1,
TP2)
–
TP1 = SP.Lo, TP2 = SP.Hi
HY
HY
Q
1
0
OUT
TP1=SP.Lo
TP2=SP.Hi
Q
1
0
OUT
HY
HY
TP1=SP.Lo
TP2=SP.Hi
1)
Only with flow measurement
2)
SP.Lo = smaller value, SP.Hi = larger value, independent of the Teach sequence
Tab. 4
Window comparator: setting of switching points SP.Lo and SP.Hi and hysteresis HY
2.2.2
Colour change
A red colour change in the display can be set for OutA, OutB and OutD. As a result, the system status
can be identified over a large distance.
The measured variable that first caused the colour change always appears in the display. The unit and
the corresponding output OutA/OutC/OutD flash in the sub display. The display remains red until all
switching outputs are in the blue status again.
