Burkert Type 8620 - Manual (Page 57)

mxCONTROL Type 8620
Page 57
The alarm information is displayed in the menu Processdata\Inputs as an icon similar to the input
alarms of frequency and analog inputs. As long as the alarm is timing (i.e. the binary input signal fits
the alarm condition, but the alarm delay time is not reached yet) a warning icon is displayed.
Configuration (CodeLevel: Specialist)
Configuration Access
via Cfg.-
menu Access
via XML-
Cfg.-File Abbre-
viation
(menu) Range Default values
(after factory reset or
at start of Cfg-File-
Download)
Enabling / disabling input rw rw Input On/Off Off
Inversion of Input signal rw rw Inv Yes / No No
Process value alarm
Alarm Mode
rw rw Mode Off, Alarm L,
Alarm H Off
Alarm delay time rw rw AlarmDel 0.0 … 1800.0 s 1.0 s
12.1.2 Frequency Inputs
Figure 13:
Frequency input
Frequency detection
The current frequency of the input signal is detected by measuring the time between two rising
edges of the input signal. Frequencies lower than 0.5 Hz are assumed as 0 Hz, frequencies higher
than 2000 Hz are rejected as interferences.
Scaling
There are two ways of scaling the frequency input signal, either
• Determining the K-Factor as well as the low and high scaling value in the desired engineering
unit or
• determining a low and high frequency value (Freq-, Freq+) with the corresponding low and
high scaling values (Scal-, Scal+) in the desired engineering unit.
The scaling procedure is determined in the configuration file for each frequency input separately by
USE_KFACTOR
USE_KFACTOR
0 Scaling with Freq- and Freq+
1 Scaling with the K-Factor
Scaling with K-Factor
The scaling with K-Factor is recommended for easy configuration of connected flow sensors.
Frequency inputs do not support the safety output function.