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TECH TALK
Setpoint Processing
Automatic Reset for COUNTER Setpoints
The counter setpoint is changed in Release 3.11 to
automatically reset to its initial value when a batch is
restarted. Prior to this release, the counter value had to be
manually re-entered.
No Limit to Number of TIMER and CONCUR Setpoints
The limitation of no more than five timer and/or concur
setpoints is removed in Release 3.11.
Front Panel Entry of Setpoint Names
Setpoint names can be changed using the SPNAME
parameter on the FORMAT menu.
Changing Setpoint KIND Resets All Setpoint Values
For Release 3.11, if a setpoint is changed from one kind
to another (in SETUP mode or using the KIND EDP
command), all parameters for that setpoint are reset to
their default values.
DIGOUTs Changed for Continuous Setpoints Using TRIP
Parameter with InBand/OutBand
Digital outputs for continuous setpoints using
TRIP=INBAND and TRIP=OUTBAND are changed in
Release 3.11 to function as follows:
• For TRIP = INBAND, the digital output is active when
the weight value is inside the band set by the BANDVAL
parameter.
• For TRIP = OUTBAND, the digital output is active
when the weight value is outside the band set by the
BANDVAL parameter.
This change reverses the digital output states
Warning
!
for setpoints using InBand/OutBand.
Existing setpoints using these values
must be redefined.
BATSTRT DIGIN Dependency on BATRUN Removed
The BATSTRT digital input no longer requires an
active BATRUN digital input to run. If no digital input
is assigned to BATRUN, batching proceeds as if
BATRUN were always on.
In prior releases, the BATSTRT digital input would not
go active unless a second digital input, assigned to
BATRUN, was active. Release 3.11 removes this
requirement for a second digital input.
If your application requires the indicator to
Warning
!
provide a means of stopping or resetting the
batch, a digital input must be assigned to
BATRUN.
A TECHNICAL PRODUCT PUBLICATION
ALARM Parameter for Batch Setpoints
The ALARM parameter is redefined for batch setpoints in
Release 3.11 to hold the alarm message active until the
setpoint is satisfied. The alarm message does not flash
when waiting for standstill as in prior releases.
HYSTER Parameter for Batch Setpoints
The HYSTER parameter is redefined for batch setpoints
in Release 3.11 to allow an assigned digital output to
control an automatic refill/discharge cycle, based on the
scale weight relationship to the setpoint VALUE and TRIP
setting.
Using this capability, a batch setpoint can be configured
to check that a scale vessel contains a minimum amount
of material and, if the weight is less than the setpoint
VALUE, refill the vessel to the weight specified by VALUE
+ HYSTER before continuing to the next setpoint.
For example,a setpoint configured with the following
values will check whether the vessel contains more than
200 lb of material.
GROSSSP ... VALUE = 200
TRIP = HIGHER
HYSTER = 1800
BATCH = ON
If the weight is greater than 200 lb (TRIP = HIGHER), the
setpoint trips (digital output goes inactive) and the batch
routine continues to the next setpoint. If the weight is 200
lb or less, the digital output stays active until the hopper
is refilled to 2000 lb (200 + 1800 HYSTER parameter
value).
Enhanced Batch Status Messages
Figure 6 (below) shows the status messages used for
interrupted batches in Release 3.11.
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Figure 6. Batch Status Messages
Additional Batch Setpoint Processing Changes
Note the following changes to batch setpoint processing
for Release 3.11:
• Batching is automatically stopped when the indicator
is placed in setup mode.
• When a batch setpoint trips, subsequent setpoints
are evaluated immediately. In prior releases, evaluation
was deferred to the next A/D cycle.
5
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(continued on next page)
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