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IC 40 function > Standard operating modes 1 – 12 > 3-step operation with one or two digital inputs
DI 1 with continuous signal, for instance resulting from in-
version of the logic, see page 57 (Switching logic):
The actuator operates in high/low (high/closed)
intermittent mode via digital input DI 2 with two
successive running times up to 51 s (2 x 25.5 s).
DI 1 and DI 2 are connected in parallel: The actuator
operates with one signal in high/closed intermit-tent
mode with three successive running times up to 76.5 s (3
x 25.5 s).
With three successive running times via interpolation
points, it is possible to change the opening
characteristic of the butterfly valve. For example, the
characteristic of the air circuit can be adapted to that
of the gas circuit.
Control via two digital inputs
If all possible combinations of the two inputs are used,
for instance by a PLC control system, it is possible to
implement high/middle/low/closed intermittent mode (3
steps plus the “closed” position).
Possible parameter set for this operating mode: P 68001,
see page 54 (Parameter sets).
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