Pepperl+Fuchs FD0-BI-Ex12.PA Betriebsanleitung Seite 22

3
4
Sensors with
integrated polarity
protection diode
In contrast to this, the vibrating forks are not connected in the 2:1 process. Instead of
them, conventional sensors or mechanical switches could also be used, but also not in
the 2:1 process.
For suitable sensors please refer to the datasheet of the sensor interface
FD0-BI-Ex12.PA.
Multiplex Operation and Cycle Time
The vibrating forks and sensors are gathered in two independent cycles. The vibrating
forks or the sensors are activated by means of multiplex operation, i. e., the individual
vibrating forks and control circuits are not continuously activated but discretely and in-
dividually.
The cycle time is the time during that a vibrating fork or a sensor is electrically evalua-
ted.
The cycle time of a vibrating fork is:
T = Number of activated vibrating forks * settling time of the vibrating forks
Fork
The settling time of the vibrating fork is the time of one value measurement of one vi-
brating fork. This value is configurable. Configurable values are 250 ms, 500 ms, 1s,
2s, 3s, 4s and 5s (see also chapter parameterization string).
Example:
If you have three activated vibrating forks and the settling time is configured to 1s, each
vibrating fork is been measured every 3 seconds.
The cycle time of a sensor is:
T = at least 62.5 ms or number of activated sensors * 12.5 ms if the value is high-
Sensor
er.
Example:
For eight activated sensors, each sensor is evaluated every 100 ms.
For three activated sensors, each sensor is evaluated every 62.5 ms.
8
Subject to reasonable modifications due to technical advances.
Pepperl+Fuchs Group • Tel.: Germany +49-621-776-0 • USA +1-330-4253555 • Singapore +65-67-799091 • Internet www.pepperl-fuchs.com
Sensor 1
3
4
Sensor 2
Sensors without
integrated polarity
protection diode
Instruction Manual
FD0-BI-Ex12.PA
Sensor 1
3
4
Sensor 2
mechanical
Copyright Pepperl+Fuchs, Printed in Germany
Sensor 1
Sensor 2
switches