Emerson Rosemount 3490 Series, Справочное руководство

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Related information
Digital control voltage-free contact inputs
Allocate an action to IN1 or IN2
Procedure
1. Navigate to
SETUP
→
[CONTROLLER]
→
DIGITAL INPUT
→
DIGITAL INPUT 1 or
DIGITAL INPUT 2 .
2. Use the action selection parameter P340 (for IN1) or P345 (for IN2) to select a
trigger action from the option list.
Table 4-4 lists all the options and explains their purpose.
Table 4-4: Digital Input Actions
Action Action that occurs while digital input is triggered
Free Digital Input has no allocated action. This is the factory default
setting.
Alarm
(1)
Forces an alarm condition, which is indicated if specified in the
OUTPUT → ALARM menu.
Fault
(2)
Forces an fault condition, which is indicated if specified in the
OUTPUT
→
FAULT menu.
Program mode Changes the control unit operating mode to Program (open
padlock).
Hold totalizer Freezes the internal totalizer.
Hold MCU PV Prevents the control unit PV value (D800) from being updated.
Suppress Alarm If the digital input is active when an alarm condition is present, a
message is displayed indicating the alarm is being overridden.
Alarm relay is held on.
Display Msg
(3)
Displays a user-defined message (P241).
Log Input
(4)
When the next data logging interval elapses, flag the data logged as
a 'bad sample' if the digital input has been active.
Pump-down
(5)
Invoke a pump-down operation.
Lock Params Prevent 'P' prefixed parameters from being edited.
Protect totalizer 1 Prevent totalizer 1 from being reset.
Reset totalizer 2
(6)
Reset totalizer 2.
(1) See Set-up alarms for information about alarms and features they affect.
(2) See Fault mode relay for how to indicate fault conditions using a relay output
(3)
SETUP
→
[CONTROLLER]
→
APPLICATION
→
Message
.
(4) Data logging is available on the Rosemount 3493.
(5) The pump-down feature is available on the Rosemount 3491 and Rosemount 3492. See
Pump-down (Rosemount 3491 and 3492 only) for further information.
(6) Totalizer 2 is available on the Rosemount 3492 and Rosemount 3493.
3. Use the delay parameter P341 (for IN1) or P346 (for IN2) if a delay is needed before
an action is performed. The setting format is m:s (minutes and seconds).
Getting started Reference Manual
January 2021 00809-0100-4841
84 Emerson.com/Rosemount