Emerson Micro Motion 3711 Configuration And Use Manual page 83

Configuring I/O
Table 7-9 Discrete Outputs – General parameters
Parameter Description
State • If Scanning is enabled, State reflects the current output of the
DO, and is updated by the Model 3711.
• If Scanning is disabled, State is not updated by the
Model 3711. Instead, the State setting is used to control the
DO output.
Momentary Off by default. Must be manually set to On. When the On radio
button is enabled and Apply is clicked, the DO switches to On
and remains On for the time period defined in Time On.
Time On Used with Momentary and DOUT Type = Toggle:
• Defines the number of seconds that the DO will remain On
when Momentary is activated.
• If DOUT Type is set to Toggle, defines the duration, in
seconds, of the On and Off portions of the DO cycle. In other
words, the DO cycle is twice the Time On value.
DOUT Type • Latched: When the DO switches from Off to On, it remains On
until cleared.
• Time Duration: When a new EU value is written, the DO is
activated once. The length of the On state is defined by the
EU Value parameter.
• Toggle: The DO repeats continuously in a cycle defined by the
Time On parameter. The On and Off states of the cycle are of
equal length.
• TDO Toggle: The DO repeats continuously in a cycle defined
by the Cycle Time parameter, with the length of the On state
defined by the EU Value parameter.
Scanning • Enabled: The output of this DO will be updated automatically,
according to the current EU value.
• Disabled: The output of this DO is not updated from the
current EU value. The output of the DO is controlled by the
configured State value.
Active Alarms Displays any alarms that are currently active for this point.
Configuration and Use Manual
Comments
In typical use:
• On = Closed
• Off = Open
Automatically resets to Off after
each activation.
When DOUT is not set to Toggle,
this field reflects the current
duration of the DO's On period.
To clear status, click the Off button,
then click Apply.
See Section 7.7.3 for information
on configuring the Time Duration,
Toggle, and TDO Toggle options.
If Alarming is enabled, an alarm is
generated when Scanning is set to
Disabled.
The field at the right of the Active
Alarm field displays the alarm bit
status value (0 to 255).
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