IC 40 · Edition 07.18
31
t [s]
high
analogue
low
closed
DI 1
t [s]
t
1
t
2
Function
3 .6 Analogue operating modes 21 – 27
General description, see page 13 (Operating modes).
3 .6 .1 2-point operation
Operating mode 21
In idle state (DI 1 with no signal), the actuator is in “low”
position (“low” position may also be 0° = “closed” posi-
tion).
If a signal is applied to digital input DI 1, the actua-
tor moves to the position preset via analogue input
4 – 20 mA. When the signal at DI 1 drops, the actuator
moves back to “low” position.
The actuator operates in analogue/low (analogue/
closed) intermittent mode, whereby the analogue signal
determines the adjustment angle for the “open” posi-
tion (= setpoint). The adjustment angle for the “open”
position, which can be varied via the analogue signal, is
set in BCSoft.
Example: 4 mA for 60% opening and 20 mA for 100%
opening. If no analogue value is preset, the actuator re-
mains in “low” position (“closed” position).
DI 1
Position
Off
low/closed
On
analogue
The opening speed is preset via the time t
1
for the entire
“low” to “high” setting travel. Accordingly, the closing
speed is set with t
2
for the entire “high” to “low” setting
travel.
Operating mode 21
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