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Appendix C

Fieldbus Parameters

C-22

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 National Instruments Corporation

The current state of the update event, along with a time and date stamp. This 
event is issued whenever a static parameter is changed and 

ST_REV

 is 

incremented.

The current state of the low alarm, along with a time and date stamp.

The software write lock for the device. When this is set to true, writes to all 
configuration parameters of all blocks are disallowed. The 

WRITE_ALM

 

block alarm is active when writes are allowed and clear when they are 
disallowed.

The priority of the write alarm.

The scaling parameter used to interpret values from the physical I/O 
channel. This is used to translate from a physical transducer value to a 
percent of scale.

Table C-16.  Scaling Parameter Values

EU_100

Engineering units value at 100 percent of scale.

EU_0

Engineering units value at zero percent of scale.

UNIT_INDEX

Actual engineering units code (such as mA).

DECIMAL

Number of digits a host shows to the right of the 
decimal for display purposes.