Setpoints
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14.3 Batching Examples
14.3.1 Example 1
The following example uses six setpoints to dispense material from a hopper in 100-lb batches and to automatically refill the
hopper when its weight drops below 300 lb.
Bits 1 and 2 in the Digital I/O menu (
) are assigned to batch start and batch run functions: Batch Run
must be on (low) before the Batch Start input starts the batch.
Slot 0, Bit 1 = Batch Start
Slot 0, Bit 2 = Batch Run
Batching = Manual
Setpoint 1 ensures the hopper has enough material to start the batch. If the hopper weight is 300 lb or higher, setpoint 1 is
tripped.
Setpoint 1
Trip = Higher
Kind = Gross
Alarm = On
Value = 300
Batch = On
Setpoint 2 waits for standstill, then performs a tare to put the indicator into net mode.
Setpoint 2
Kind = Wait Standstill
Push Tare = On
Setpoint 3 is used as a reference (relative setpoint) for setpoint 4.
Setpoint 3
Trip = Higher
Kind = Net
Batch = Off
Value = 0
Setpoint 4 is used to dispense material from the hopper. When the hopper weight falls to 100 lb less than its weight at the
relative setpoint (setpoint 3), digital output 1 is set off.
Setpoint 4
Digital Output = 1
Kind = Negative Relative
Batch = On
Value = 100
Relative Setpoint Number = 3
Trip = Lower
Setpoint 5 is used to evaluate the gross amount of material in the hopper after dispensing, and to maintain a minimum material
level in the hopper. When the hopper weight falls below 300 lb, digital output 2 becomes active and the hopper is refilled to
1,000 lb.
Setpoint 5
Hysteresis = 700
Kind = Gross
Digital Output = 2
Value = 300
Batch = On
Trip = Higher
Setpoint 6 is used to ensure 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
Start = 4
Kind = Timer
End = 5
Value = 100
Digital Output = 4
Summary of Contents for REVOLUTION 682 Synergy Plus
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