Emerson Series 3000 MVD User Manual

64

The ON/OFF states of the discrete output are controlled by the discrete input, discrete event, or 
process condition assigned to the discrete output as a source variable. See Table 8-2. 

When the discrete batch application is installed, one or more of the discrete outputs must be used to 
control the pump, primary valve, or secondary valve. See the following section entitled Discrete batch 
requirements.

To avoid batch overrun or a deadhead pump, do not connect a discrete output to a 
pump if “batch in progress” is assigned to the output.

None

None

The discrete output is inactive.

Discrete input 1

The discrete output will be controlled by discrete input 1.

Discrete input 2

The discrete output will be controlled by discrete input 2.

Discrete event 1

The discrete output will be controlled by discrete event 1.

Discrete event 2

The discrete output will be controlled by discrete event 2.

Discrete event 3

The discrete output will be controlled by discrete event 3.

Discrete event 4

The discrete output will be controlled by discrete event 4.

Discrete event 5

The discrete output will be controlled by discrete event 5.

Flow switch

The discrete output will be controlled by the occurrence of a flow switch.
See the section entitled 

Flow switch later in this chapter.

Flow direction

The discrete output will be controlled by the flow direction.

Calibration in progress

The discrete output ON state will indicate calibration in progress.

Fault condition

The discrete output will indicate any condition that produces a fault alarm.
For information about fault alarms, see Section 22.6.

Batch timeout

At start of batch or at any time before batch completion, the discrete output will 
be active if no flow has been measured for the amount of time configured for 
time out.

Batch in progress

The discrete output will indicate the batch is in progress.

• “Batch in progress” is a status indicator only.
• Because “batch in progress” remains active until the batch is completed or 

ended, using “batch in progress” to control a pump can cause batch overrun 
or a deadhead pump.

Batch end warn

The discrete output will indicate when the batch total has exceeded the 
percent of target or quantity subtracted from target that is configured for batch 
end warn.

Batch overrun

The discrete output will indicate when the batch total has exceeded the 
amount configured for batch overrun.

Batch pump

The discrete output will control the system pump. The pump remains on while 
the primary or secondary valve is open.

Batch primary valve

The discrete output will control the primary valve.