114
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 chapter on
“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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