
64
Micro Motion
®
Model 3711 Gas Flow Computers
Configuring I/O
7.4.2
Analog Input – General panel
The Analog Input – General panel is shown in Figure 7-2. Parameters on this panel are listed and
defined in Table 7-1.
7.4.3
Analog Input – Advanced panel
The Analog Input – Advanced panel is shown in Figure 7-3. Parameters on this panel are listed and
defined in Table 7-2.
Table 7-1
Analog Inputs – General parameters
Parameter
Description
Comments
Point Number
The module slot number and channel number for this point.
Not configurable.
Value
• If Scanning is enabled, the Model 3711 will automatically
process the value from this AI at intervals defined by Scan
Period, and this parameter is ignored.
• If Scanning is disabled, the value entered here will override
the input value.
Units
A description of the engineering unit (EU) that this AI
represents; 10 characters maximum.
Examples: PSIG, MCF, Degrees F,
Milliamps, Volts
Scan Period
The number of seconds to wait between updates of the Filter
value (see Table 7-2) for this AI.
Not configurable.
Low Reading EU
The EU value corresponding to an input level of 0% (4 mA).
Used in conversion of the analog
signal to a digital EU value.
For example, if the AI is receiving
data from a temperature device
with a range of –40 to +160 degF,
set this parameter to –40.
High Reading EU
The EU value corresponding to an input level of 100% (20 mA).
Used in conversion of the analog
signal to a digital EU value.
For example, if the AI is receiving
data from a temperature device
with a range of –40 to +160 degF,
set this parameter to +160.
Active Alarms
Displays any alarms that are currently active for this point.
The field at the right of the Active
Alarm field displays the alarm bit
status value (0 to 255).
Scanning
• Enabled: This AI will automatically process the value from the
remote device at intervals defined by Scan Period.
• Disabled: The value from the remote device is ignored and the
configured Value is used in its place.
If Scanning is disabled and
Alarming is enabled, an alarm is
generated.
Alarming
• Enabled: The limit alarms are enabled and all alarms
associated with this AI are logged. The limit alarms are
configured on the Alarm panel.
• Disabled: Limit alarms are disabled. The Point Fail and
Manual Mode alarms may appear in the Active Alarms field,
but no alarms will be logged.
To conserve alarm log space,
enable alarms only when
necessary.
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