Emerson AC8 5.4.1Select a Sensor, 5.4.2View a Trend Log, Viewing Additional Screens, Main Menu

View Status Options

5.4View Trend Log

The AC8 takes readings of configured analog input sensors at regular intervals and stores them in four separate trend logs, one for each sensor. The time interval is 30 minutes. Each log contains up to 100 records.

Follow these steps to select a sensor and view its trend log:

5.4.1Select a Sensor

To select a sensor:

• From the Main Menu, use the arrows ↑↓ to choose View Status, then press Enter ↵.

• From the View Status Menu, use the arrows ↑↓ to choose View Trend Log, then press Enter ↵ .

• From the Sensor Selection Menu, use the arrows ↑↓ to choose the sensor you want to view—Sensor_1in the example at right—and press Enter ↵ .

5.4.2View a Trend Log

The Trend Log screen displays up to 100 records for the selected sensor. If the log contains records, the screen displays details for each reading:

•the name of the selected sensor (for example, SENSOR_1)

•the reading (75.4 DEG)

•a brief description of the reading status (NORMAL)

•the date and time of the reading

Table 10 shows conditions that the trend log records for analog inputs. Each analog input has its own trend log.

Table 10 Trend log conditions

SOURCE	Analog Input
CONDITIONS	LOW SETPOINT ALARM
RECORDED	LOW SETPOINT EVENT
	HIGH SETPOINT ALARM
	HIGH SETPOINT EVENT
	RETURN TO NORMAL
	NORMAL
	SENSOR PROBLEM (denoted by dashes ------)

Main Menu

>VIEW STATUS SYSTEM AND CONTROL

↑↓ =NEXT ↵ =SELECT

View Status Menu

VIEW ACTIVE ALARMS

VIEW ALARM LOG

VIEW EVENT LOG

>VIEW TREND LOG

VIEW INPUT STATUS VIEW OUTPUT STATUS VIEW PAGER NUMBERS VIEW OPERATION VIEW CONTROL STATUS

Select Sensor Menu

SENSOR TO VIEW?
> SENSOR_1
SENSOR_2	↵ =SELECT
↑↓ =NEXT
SENSOR_3
SENSOR_4

Trend Log

> TREND LOG	100/100
SENSOR_1	75.4	DEG
NORMAL
28-AUG-05	15:45:51
SENSOR_1	70.5	DEG
LOW SETPOINT EVENT
28-AUG-05	15:15:51
SENSOR_1	79.9	DEG
RETURN TO NORMAL
28-AUG-05	14:45:21

If there are no records in the log, the screen displays the message:

NO TRENDS

Viewing Additional Screens

There may be up to 100 records of trend data for the selected sensor.

•To view additional records, use the arrows ↑↓ .

•To return to the previous screen, press the ESC key.

5.4.3Backing Up the Trend Log (Service Terminal Interface only)

The four trend logs are stored as files in the AC8, with a maximum of 100 records per sensor. When a log is full, the oldest records are deleted from the end of the file as new trend records are added at the beginning.

You may back up each trend log file to a remote computer using the Service Terminal Interface, as described in 6.2 - Back Up Log Files (Service Terminal Interface only).

To delete all records in the trend logs, see 7.13 - Clear Alarms & Logs.

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