IDL 101
FUNCTIONAL DESCRIPTION
HB_IDL101_E_V222.doc
51
Gantner Instruments Test & Measurement GmbH
Minimum and Maximum of a Variable Value (
min, max
)
With this function the minimal and maximal value of a variable appeared since the last reset has been
triggered off can be determined ("
pull-pointer function
"). The result value can be reset to the actual value of
the measured variable via the bus or via a digital input or via every other variable.
Lowest and Highest Value of Several Operands (
low, high
)
With this function up to four sensor variables can be compared with each other and the lowest or highest
value respectively can be determined.
Pull-Pointer Function
:
The pull-pointer function can for example be realized with analog measuring instruments. Thus the pointer of the
measuring instrument pushes a second pointer in front of it. This second pointer cannot swing back by itself, but will
remain on the place of the maximal value. Only after pressing a reset key the pull-pointer will be set back to the original
value of the measuring pointer.
Notice
: In order to prevent an effect of disturbances of the sensor signals on the functions min, max, low and high of
the Arithmetic Variable a filter should be added to the measuring variables integrated in the formula.
Notice
: Logic combinations, e.g. if-then relations, are not possible at the moment or require a customer or user-specific
download-program respectively.
Constants:
Constant Sign Value
Pi Pi 3,141593
Pi/2 Pi/2 1,570796
e e 2,718282
Acceleration of gravity g 9,80665
Free definable constant const adjustable
Table 6.4 Constants
6.5. Setpoint Variable
This channel offers the possibility of transmitting values via bus to the data logger. The values are allocated to the
Setpoint Variable and are thus at the disposal of the data logger for further processing.
A typical application for the Setpoint Variable is e.g. the dynamic variation of supervision thresholds.
6.6. Alarm Variable
The Alarm Variable has the same features as the process-controlled Digital Output Variable, the only difference being
that the status information is not output locally at the digital output, but can only be scanned via the bus.
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