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IC 40 function > Standard operating modes 1 – 12 > 2-step
operation with one or two digital inputs
t
1
t
2
t [s]
This may prove to be practical in order, for instance, to
purge a furnace or kiln via DI 1 (independently of DI 2). It is
then possible to operate with both inputs in
high/middle/low intermittent mode.
Possible parameter sets for this operating mode:
P 68015, P 68016, see page.54 (Parameter sets).
Control via one digital input
If digital input DI 1 is activated (DI 2 with no signal), the
actuator moves to “high” position. The running times t
1
and t
2
run directly in succession.
Likewise, the actuator closes in the successive running
times t
3
and t
4
if signal DI 1 drops. The “middle” position
serves as an interpolation point and can be freely
programmed.
Owing to the two successive running times, the opening
characteristic of the butterfly valve can be changed. For
example, the characteristic of the air circuit can be
adapted to that of the gas circuit.
Running times up to 51 s (2 x 25.5 s) are possible in this op-
erating mode. If the signal at digital input DI 1 is
deactivated before “high” position is reached, the
actuator moves directly to “low” position in the
percentage times of t
3
and t
4
.
The actuator operates in high/low (high/closed)
intermittent mode.
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