158
Outputs - Parameter
Type 8098
16.5.2
Configuring a digital output as an output with switching
thresholds
An output with switching thresholds switches depending on two threshold process values.
The output can switch either according to an hysteresis model or according to a window model.
Hysteresis switching
The output status changes when a threshold is reached:
•
by increasing values, the output state changes when the high threshold X+ is reached.
•
by decreasing values, the output state changes when the low threshold X- is reached.
ON
OFF
Contact
X- X+
process value
Not inverted
ON
OFF
Contact
X- X+
process value
Inverted
X- = low switching threshold
X+ = high switching threshold
Figure 28:
Hysteresis switching
Window switching:
the output state changes as soon as any threshold (X- or X+) is reached.
Contact
X- X+
process value
Not inverted
ON
OFF
Contact
X- X+
process value
Inverted
ON
OFF
X- = low switching threshold
X+ = high switching threshold
Figure 29:
Window switching
To configure a digital output as an output with switching thresholds, do the following:
→
Select the device in the navigation area.
→
Outputs
→
Parameter
→
Output 2:digital
or
Output 3:digital
→
Mode
→
Select
Threshold
→
Settings
The current settings are displayed.
→
Select the process value associated to the digital output
→
Select the
hysteresis
switching or the
window
switching of the digital output
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