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IC 40 function > Analogue operating modes 21 – 27
> 2-point operation with characteristic curve switchover II
This allows the same current signal to be used for running
through two different capacity ranges, for example for
lambda adjustment or for hot-air compensation.
Intermittent operation
DI 2 with no signal:
The actuator operates in analogue chart 1/low (analogue
chart 1/closed) intermittent mode via digital input DI 1.
DI 1 with no signal:
The actuator operates in high/low (high/closed)
intermittent mode via digital input DI 2.
DI 1 and DI 2 simultaneously with ON or OFF signal:
The actuator operates in analogue chart 2/low (analogue
chart 2/closed) intermittent mode.
If all possible combinations of the two inputs are used, for
instance by a PLC control system, this allows
high/analogue chart 1/analogue chart 2/low (closed)
intermittent mode to be implemented.
Continuous operation
The actuator may also operate in continuous mode via
cur-rent input 4 – 20 mA. In this case, it is possible to switch
over between two characteristic curves via the digital
inputs, see page 57 (Inputs).
As with operating mode 25, this allows lambda adjustment
or hot-air compensation to be implemented.
Possible parameter set for this operating mode:
P 68031, see page 54 (Parameter sets)
50
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