Outputs
DIQ/S 281
100
ba77244d01
08/2020
6.6.6
Pulse-width output
Function
The characteristic of the pulse width output is laid down in the
Start value
,
End
value
,
Pulse width (v) min.
and
Pulse width (v) max.
settings. The fundamentals
of the function are described in the introductory chapter (see section 6.2.3).
In order to set up the
Pulse-width output
function for a relay output, the relay
output must be linked with a sensor (see section 6.4).
Settings
Characteristic
curve
You can specify the minimum and maximum pulse width (v). This determines
the steepness of the characteristic curve of the output.
6.6.7
Cleaning
Function
The
Cleaning
function enables the time controlled automatic start of the sensor
cleaning function with the aid of a relay of the combination output module.
The relay controls the DIQ/CHV valve module and switches the compressed air
for the CH sensor cleaning head on or off.
Setting
Selection/Values
Explanation
Measured variable
Main variable
Adjoining variable
Main variable
designates the
actual measured parameter
of the sensor (e.g. pH,
oxygen, etc.).
Adjoining variable
designates
an additional measured
parameter (e.g.
temperature).
Start value
within the
measuring range
(sensor-
dependent)
Minimum spacing:
5 % of the measuring range
End value
Pulse width (v) min.
0 ... 100 %
Minimum spacing:
10 % of the
Cycle duration
(T)
Pulse width (v) max.
Cycle duration (T)
5 ... 100 s
Length of the switching
period T
T = (t
on
+ t
off
)
Error pulse width
0 ... 100 %
In case of system errors or
sensor errors (see
page 112), the relay switches
with the pulse-width
specified.
Action
Open
Close
Relay action (see
section 6.6.1)
