Siemens SITRANS LR 300, Instruction Manual, Page: 88 / 140

Page 86 SITRANS LR 300– INSTRUCTION MANUAL 7ML19985CL02
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Communicat
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Primary Index (R43,999) and Secondary Index
(R43,998)
Many parameters are indexed. There are two possible indexes, a primary index and a
secondary index. A secondary index is a sub-address of the primary index.
If there is not an index, enter a value of 1.
Reading Parameters
1. Write the primary index value into R43,999.
This is a value between 1 and 40 that specifies the primary index on the parameter.
This value is normally 1.
2. Write the secondary index value into R43,998.
This is a value between 1 and 40 that specifies the secondary index on the
parameter. This value is normally 1.
3. Write the desired format value into R43,997.
4. Read the value from the appropriate parameter register.
Types of values are:
• Numeric Values on page 87.
• Split Values on page 87.
• Text Messages on page 88.
A value of 22,222 indicates that an error has occurred. Specify a different format type and
try again.
Writing Parameters
The method of writing parameters is similar to the method of reading them. Become
familiar with Reading Parameters, (above), before attempting to write any parameters.
Writing parameter values to the SITRANS LR 300:
1.
Write the primary index value into R43,999.
2. Write the secondary index value into R43,998.
3. Write the desired format value into R43,997.
4. Write the value to the appropriate parameter register.
SITRANS LR 300.book Page 86 Monday, June 10, 2002 7:18 PM