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64 Micro Motion
®
Series 3000 MVD Transmitters and Controllers
Configuring Outputs
8.3.2 Source variable assignment
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.
CAUTION
If “batch in progress” is assigned to a discrete output, connecting the output
to a system pump can cause batch overrun or a deadhead pump.
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.
Table 8-2 Discrete output source variables
Source variable Default Description
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.