Checkweighing
H
66
Preparation
The checkweighing program often
requires a target value for comparison
with the current value. This target has
a tolerance range, which is defined by
absolute weight values. The tolerance
range is defined as either an absolute
value or a percentage with upper and
lower limits. The values defining the
limits can be symmetric or asymmetric
to the target value. These values can
be entered either by storing weights on
the scale or by key input.
There are four control lines, called data
output port lines, which are activated
as follows: (see also the diagram at the
right):
– lighter
– equal
– heavier
– set
The control range spans 30% to 170%
of the target value. You can configure
this parameter in the Setup menu
(... Application 2: Checkweighing:
Activation of port lines:) to select
whether the control lines are:
– activated within the checkweighing
range
– always on
– activated at stability within the
checkweighing range
– activated at stability
– activated at stability within the
checkweighing range
–> once
This makes it possible, for example,
to connect a simple indicator for the
weighing results (e.g., three different
colors, one each for the weighing
results: too light, O.K., too heavy).
Response of Control Lines During Checkweighing
Configurations:
– always on
– activated at stability
12-pin via Zener barrier
Configurations:
– activated within checkweighing range
– activated at stability within checkweighing range
– activated at stability within checkweighing range
12-pin via Zener barrier
For further information about the pin assignment, see “Pin Assignment Charts.”
Output port specifications
– When not in use, the voltage level is high: >2.4 V/+2mA.
– When activated, the voltage level is low: <0.4 V/-2mA.
!The output ports are not protected against short circuits!
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