IC 40 · Edition 07.18
35
analogue
t [s]
high
low
closed
DI 1
DI 2
t [s]
t
1
t
2
{
Function
3 .6 .3 2-point operation with input-dependent
adjustment angle for the “open” position
Operating mode 23
The function corresponds to operating mode 22 apart
from the fact that both digital inputs function as pulse
inputs.
The actuator operates in high/low (high/closed) inter-
mittent mode via digital input DI 1.
The actuator operates in analogue/low (analogue/
closed) intermittent mode via digital input DI 2.
A signal at DI 1 (priority) always leads to approaching
“high” position. This application can be used for purging
a furnace or kiln, for instance.
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.
Depending on the adjustment angle for the “open” po-
sition, the heat output can be reduced and a uniform
temperature distribution in the furnace or kiln can be
achieved nevertheless owing to intermittent operation
of the burner. The “high” position may also be lower
than the “analogue” position in this case.
DI 1
DI 2
Position
Off
Off
low/closed
On
Off
high
Off
On
analogue
On
On
high (DI 1 has priority)
Possible parameter set for this operating mode:
P68028, see page 45 (Parameter sets).
Operating mode 23