Rice Lake IQ plus 710, Installation Manual

Page: 56 / 76

Setpoints 53
8.2 Batching Examples
8.2.1 Example 1
The following example uses seven setpoints to
dispense material from a container in 100
LB
batches
and to automatically refill the container when its
weight drops below 300
LB
.
Digital inputs 1 and 2 are assigned to batch start and
batch run functions: BATRUN must be on (low)
before the BATSTRT input starts the batch.
DIGIN1=BATSTRT
DIGIN2=BATRUN
BATCHNG=MANUAL
Setpoint 1 ensures that the container has enough
material to start the batch. If the container weight is
300
LB
or higher, setpoint 1 is tripped.
SETPOINT=1
KIND=GROSSSP
VALUE=300
TRIP=HIGHER
BATCH=ON
ACCESS=ON
Setpoint 2 waits for standstill, then performs a tare to
put the indicator into net mode.
SETPOINT=2
KIND=WAITSS
PSHTARE=ON
ACCESS=ON
Setpoint 3 is used as a reference (relative setpoint) for
setpoint 4 and is tripped with a weight of 0±2
LB
.
SETPOINT=3
KIND=NETSP
VALUE=0
TRIP=HIGHER
BATCH=OFF
ACCESS=ON
Setpoint 4 is used to dispense material from the
container. When the container weight falls to 100
LB
less than its weight at the relative setpoint (setpoint 3),
digital output 1 is set off.
SETPOINT=4
KIND=–RELSP
VALUE=100
TRIP=LOW
BATCH=ON
ACCESS=ON
DIGOUT=1
RELNUM=3
Setpoint 5 is a short (.2-second) delay used to provide
an end point for a timer setpoint (setpoint 6).
SETPOINT=5
KIND=DELAY
VALUE=2
ACCESS=ON
Setpoint 6 is used to ensure that the operation
performed in setpoint 4 is completed within 10
seconds. The START and END parameters identify
the setpoints monitored by the timer. If the timer
expires before setpoint 5 starts, digital output 4 is
turned on as an alarm to signal a process fault.
SETPOINT=6
KIND=TIMER
VALUE=100
START=4
END=5
ACCESS=ON
DIGOUT=4
Setpoint 7 is a continuous setpoint, used to maintain
the material level in the container. When the container
weight falls below 300
LB
(
VALUE – HYSTERESIS
),
digital output 2 is turned on and the container refilled
to 1000
LB
.
SETPOINT=7
KIND=GROSSSP
VALUE=300
TRIP=HIGHER
HYSTER=700
BATCH=ON
ACCESS=ON
DIGOUT=2
The ACCESS parameter should be set ON when
creating and testing batch routines. Once the batching
routine is complete and ready for production,
ACCESS can be set to OFF to prevent changes to the
configured setpoint value, or to HIDE to prevent
changing or viewing the value.