Menu Inputs
21
Special abilities of the inputs
The inputs also permit as measured analogue variable
Voltage
including the necessary scaling. By
this the determination of the value range is to be effected.
For program reasons, the same configuration options are available with all inputs for the
voltage
measurement value.
The following points must therefore be taken into account:
Inputs 1-7
and
9-16
can process a maximum
voltage
of
5 volts
The heat meter function cannot establish the
flow
rate
for
inputs 15
and
16
from a voltage
signal.
Input 8
also allows
current
and
resistance
as measurement.
The process values of
voltage
,
current
and
resistance
are processed as dimensionless values
(without decimal point).
Example
:
TYPE: ANALG.
MEAS.VAR: Voltage
PROC VAR: Voltage
DESIGNATOR
GROUP: General
DES: Fill level
SCALING:
0.00 V : 0
10.00 V : 100
AVERAGE: 1.0 sec
Specification of the value range using scaling
The calculated voltage rate is averaged over 1 sec.
In addition, the
inputs 15 and 16
are able to detect faster pulses (pulse duration min. of 50 ms, pause
of min. 50 ms). Thereby they are suitable as inputs for volume flow encoders.
The parameterizing of a pulse input leads to the following indication:
TYPE: IMPULSE
MEAS.VAR: Flow rate
DESIGNATOR
GROUP: General
DES: Flow rt sol
QUOTIENT: 0.5 l/Imp
Per each 0.5 litres a pulse is received
AVERAGE: 1.0 sec
The calculated flow rate is averaged over 1 sec
When selecting the measured variable
Flow rate
, also the “QUOTIENT” is to be entered. It describes
which flow rate creates a pulse. Some of the function modules such as the heat meter have the ability
to directly handle these pulses. The control unit calculates at the same time the effective flow rate as
number by putting together the received pulses, the quotient and the calculation of a mean. This
number is available as information also internally. All functions linked with pulse input decide inde-
pendently on which pulses or flow rate they want to receive as numerical value.
