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Instruction Manual

D103621X012

4320 Position Monitor

April 2014

Long Tag—enter the HART Long Tag information (up to 32 characters).

Date—enter a date (mm/dd/yyyy) associated with configuration, commissioning, or maintenance history.

Description—enter a descriptor for the application with up to 16 characters. The descriptor provides a longer

user‐defined electronic label to assist with more specific instrument identification than is available with the HART tag.

Message—enter any message with up to 32 characters. Message provides the most specific user‐defined means for

identifying individual instruments in multi‐instrument environments.

Polling Address—used by the Host to identify a field device on the wired maintenance port (valid range is 0 through 63).

It has no significance on the wireless network and can only be edited at the maintenance port.

Structure

Snap Acting Control—when enabled, control valve action is derived from the position feedback or position being

monitored. The controlled valve is separate from the position being monitored by the device. (There is no feedback

signal for the controlled equipment.) The state of the switch monitoring the sensor generates the command to the

controlled equipment.

Direct-Acting Snap—high or open trip on the input causes the controlled valve to open. Low or closed trip on the

input causes the controlled valve to close.

Reverse-Acting Snap—high or open trip causes the controlled valve to close. Low or closed trip causes the controlled

valve to open.

Adjust switch thresholds and deadband for additional refinement of this behavior. If the device is a controller and not

in snap-acting mode, it may not report the Process state or use a latching switch mode.

When Snap-Acting Control is disabled, the device is in normal feedback control mode.

Note

Snap Acting Control is only available for units equipped with the on/off control option.

Latching Mode—when enabled, any change to the specified switch state (either opened/high or closed/low) will be

latched (or locked) in that condition until the latch mode is manually reset.

Note

Latching Mode can only be used in monitoring and snap-acting control applications. It is disabled in normal feedback control mode.

Application Mode—indicates sensor reporting mode: process feedback or valve travel feedback. A device with the

controller option installed must report valve travel when not in snap-acting mode.

Configure Structure—select whether the control mode is snap-acting, whether the switch state will latch when tripped,

and whether the position variable is labeled for valve or process reporting.

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Emerson Fisher 4320 Bedienerhandbuch Seite 40