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Configuration and Use Manual 81
Configuring Discrete Events
Configuring Batch Configuring Process MonitorConfiguring OutputsConfiguring Events
Step 4 High and low values
For the process variable assigned to the selected discrete event, configure a high value, a low value, or
high and low values, as required by the event type. Enter values in the unit that is configured for the
selected process variable. See Table 10-2 for definitions and descriptions.
Values are exclusive. For example, if the event type is HI, and the HI PV value is set to 100 lb/min:
• If the flow rate equals 100 lb/min, the discrete event does not occur.
• If the flow rate exceeds 100 lb/min, the discrete event occurs.
Step 5 Discrete event actions
To assign an action to a discrete event:
• To assign flowmeter zero, see Section 7.3.5.
• To assign a totalizer control action, see Section 7.3.5.
• To assign a batch control function, see Section 11.7.
• To assign a discrete output, see Section 8.3.2.
• To assign a print function, see Chapter 15.
• To assign a meter verification test, see Section 7.3.5.
If the enhanced density application is installed, you may also assign the “next curve” function.
If more than one action is assigned to a single discrete event, all assigned actions are performed when
the discrete event occurs.
Table 10-2 High and low values of process variables
Variable Description
HI PV value • If event type is HI or OUT HI/LO, enter the value above which the discrete event will occur.
• If event type is IN HI/LO, enter the value below which the discrete event will occur.
• If event type is OUT HI/LO or IN HI/LO, you must also enter a LO PV value.
LO PV value • If event type is LO or OUT HI/LO, enter the value below which the discrete event will occur.
• If event type is IN HI/LO, enter the value above which the discrete event will occur.
• If event type is OUT HI/LO or IN HI/LO, you must also enter a HI PV value.
Example
Configure discrete event 1 so it will stop all totalizers when the mass
flow rate in forward or backward direction is less than 2 lb/min.
1. Select lb/min as the mass flow unit. See Section 7.3.2.
2. Configure the flow direction parameter for absolute value. See
Section 7.3.2.
3. Configure discrete event 1 so the event type is LO and the process
variable is mass flow.
4. Enter a value of 2 for the LO PV value.
5. Exit the Measurements menu.
6. Using the Inputs/Core Processor parameters/Discrete Inputs
menu, assign Start/stop all totals to discrete event 1. See
Section 7.3.5
.