User manual

Computer Gateway User Manual 4-51 5/96
4.6.4
ASCII Words 1..12—value (ASCII characters)
Word 13—store status (integer)
Enumeration Words 1..4—value (enumeration)
Word 5—store status (integer)
Ordinal Value Word 1—value (integer)
of Enumeration Word 2—store status (integer)
Internal Entity ID Words 1..4—value (internal format)
Word 5—value status (integer)
LCN Internal Time Words 1..2—seconds since 1 January 1979
(32-bit integer)
Word 3—tenths of ms in current second
(integer)
Word 4—value status (integer)
ASCII String Words 1..20—value (ASCII characters)
(40 characters) Word 21—value status (integer)
Use information: The number of point/parameters is limited to a total of 300 or less.
See heading 4.1.5. The Internal DDT used by this request must
be previously created (messages 6 and 9) with no errors reported.
Because of the possibility for errors in point and parameter
definition, caution in use of this message type is advised. One
suggested technique is to read and check the data values before
attempting to change them.
The store status controls what—if any—value is to be stored.
0=Store the data value provided
1=Store the bad value representation instead
2=Do not store any value
Store status value of 1 is valid only for Real or ASCII data. The
bad value representations are NaN for Real values and question
mark strings for ASCII.
The result from a store status of 1 depends on the point type. For
reals and integers, NaN (-0) is stored. For ASCII values and
enumerations, strings of question marks are stored.
The "do not store" (store status = 2) allows for selective storing to
a portion of the points named by the Internal DDT. Return status
for these points is set to 255 (Directed no store).
This message type can store character-string values to standard
enumerations, but not to self-defined enumerations. Storing of
ordinal values to self-defined enumerations is permitted. For
further information on standard enumerations, see the Hiway
Gateway Parameter Reference Dictionary, the Process Manager
Parameter Reference Dictionary, and the Computer Gateway
Parameter Reference Dictionary.