Emerson 644 Self Test Procedure for the LCD, Symptom Possible Causes Recommended Action, Auto

Reference Manual

00809-0400-4728, Rev AA June 2011

Rosemount 644

LCD Transducer block

Table 3-11. LCD Transducer Block BLOCK_ERR messages

This section describes error conditions found in the LCD Transducer Block. Read Table 3-11and to determine the appropriate corrective action.

Self Test Procedure for the LCD

The SELF_TEST parameter in the Resource block will test LCD segments. When running, the segments of the display should light up for about five seconds.

If your host system supports methods refer to your host documentation on how to run the “Self Test” method. If your host system does not support methods, then you can run this test manually be following the steps below.

1.Put Resource block into “OOS” (Out of Service).

2.Go to the parameter called “SELF_TEST” and write the value Self test (0x2).

3.Observe the LCD screen when you are doing this. All of the segments should light up.

4.Put the Resource block back into “AUTO.”

Condition Name and Description

Other

Out of Service: The actual mode is out of service.

Symptom	Possible Causes	Recommended Action
The LCD displays “DSPLY#INVLID.” Read the	One or more of the display parameters are	See “LCD Transducer Block” on
BLOCK_ERR and if it says “BLOCK	not configured properly.	page 3-14.
CONFIGURATION” perform the Recommended Action
The AI.OUT readings do not match.	The OUT_SCALE of the AI block is not	See “Analog Input (AI) Function
	configured properly.	Block” on page 3-21.
“644” is being displayed or not all of the values are	The LCD block parameter	See “LCD Transducer Block (index
being displayed.	“DISPLAY_PARAMETER_SELECT is not	number 1200)” on page 3-4.
	properly configured.
The display reads OOS.	The resource and or the LCD Transducer	Verify that both blocks are in
	block are OOS.	“AUTO.”
The display is hard to read.	Some of the LCD segments may have	See XXXX (Self Test). If some of the
	gone bad.	segment is bad, replace the LCD.
	Device is out o the temperature limit for the	Check ambient temperature of the
	LCD. (-20 to 80 °C)	device.

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