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Reference Manual
00809-0400-4728, Rev AA
June 2011
3-24
Rosemount 644
LCD Transducer block This section describes error conditions found in the LCD Transducer Block.
Read Table 3-11 and 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.”
Table 3-11. LCD Transducer
Block BLOCK_ERR messages
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
BLOCK_ERR and if it says “BLOCK
CONFIGURATION” perform the Recommended Action
One or more of the display parameters are
not configured properly.
See “LCD Transducer Block” on
page 3-14.
The AI.OUT readings do not match. The OUT_SCALE of the AI block is not
configured properly.
See “Analog Input (AI) Function
Block” on page 3-21.
“644” is being displayed or not all of the values are
being displayed.
The LCD block parameter
“DISPLAY_PARAMETER_SELECT is not
properly configured.
See “LCD Transducer Block (index
number 1200)” on page 3-4.
The display reads OOS. The resource and or the LCD Transducer
block are OOS.
Verify that both blocks are in
“AUTO.”
The display is hard to read. Some of the LCD segments may have
gone bad.
See XXXX (Self Test). If some of the
segment is bad, replace the LCD.
Device is out o the temperature limit for the
LCD. (-20 to 80 °C)
Check ambient temperature of the
device.