Emerson MICRO MOTION 2700 Manual de Instalação descarregar pdf (Página 102)

92 Transmitter Configuration and Use: Series 1000 and 2000 Transmitters

Optional Configuration continued

8.10 Configuring events

An event occurs if the real-time value of a user-specfied process variable varies

beyond a user-specified value. Events are used to perform specific actions on the

applications platform. For example, the event can be defined to activate a discrete

output if the flow rate is above a specified value. The discrete output, then, may be

configured to close a valve.

You can define one or two events. You may define the events on a single process

variable or on two different process variables. Each event is associated with either a

high or a low alarm.

Configuring an event includes the following steps:

1. Selecting event 1 or event 2.

2. Assigning a process variable to the event.

3. Specifying an alarm type:

• Active high – alarm is triggered if process variable goes above setpoint

• Active low – alarm is triggered if process variable goes below setpoint

4. Specifying the setpoint – the value at which the event will occur or switch state (ON to OFF, or

vice versa).

Note: Events do not occur if the process variable equals the setpoint. The process variable must be

greater than (Active high) or less than (Active low) the setpoint for the event to occur.

8.10.1 Reporting event status

There are several ways that event status can be reported:

• If your transmitter has a discrete output, the discrete output can be configured to switch states

according to event status (see Section 6.7).

• The display shows Alarm 108 (Event 1 On) or Alarm 109 (Event 2 On).

• Event status can be queried using digital communications:

- ProLink II automatically displays event information on the

Informational panel of the

Status window.

- The Communicator reports Alarm 108 (Event 1 On) or Alarm 109 (Event 2 On), and also

shows event status in

Process Variables/View Status.

8.11 Configuring slug flow limits and duration

Slugs—gas in a liquid process or liquid in a gas process—occasionally appear in

some applications. The presence of slugs can significantly affect the process density

reading. The slug flow parameters can help the transmitter suppress extreme

changes in process variables, and can also be used to identify process conditions that

require correction.

• Model 1500 AN

• Model 1700 AN

• Model 1700 IS

• Model 2500 CIO

• Model 2700 AN

• Model 2700 IS

• Model 2700 CIO

• Model 1500 AN

• Model 1700 AN

• Model 1700 IS

• Model 2500 CIO

• Model 2700 AN

• Model 2700 IS

• Model 2700 CIO

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