ProSoft Technology PS-QS-1x10-0781 - Manual (Page 29)

FieldServer Configuration Manual Page 29 of 90
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5.2.9 Match-pattern
The match pattern move is used at run time to move a customized single value based on combinations of values in
a Data Array as compared with preloaded customized criteria.

The user builds a table of patterns (strings of tokens separated by “-“) each linked to a particular location
in a target Data Array.

A “PATTERN DID NOT MATCH” string may also be defined and linked to a Data Array location.

A pattern is built based on the values in the Data Array at run time by the move function.

The pattern built at run time is compared with the preloaded table of patterns. The tokens in each
pattern must match exactly. If the preloaded pattern contains a wildcard (*), that token would not be
compared.

If the pattern matches a pattern in the table, its value will be stored in the target Data Array at the
specified location.

If the pattern does not match any of the preloaded patterns in the table a check is done for a “PATTERN
DID NOT MATCH” string in table. If found, the corresponding value will be stored in the target Data Array.

If a “PATTERN DID NOT MATCH” string is not defined, a default value of –1 will be stored and an SDO will
be generated prompting the user to add a “PATTERN DID NOT MATCH” record to the table.
In the example below, a combination of 4 values in a “Tokens” Data Array shows the status. The FieldServer can
perform “match-pattern” arithmetic and store the status as a single number 0 thru 8.
Data_Arrays
Data_Array_Name , Data_Format , Data_Array_Length
Tokens
, Byte , 4
Status , Int , 1
Consider the following combinations of 4 values, here * is a wildcard. The token starting with the wildcard will not
be compared.
Data Array Values Status Description Status Value for Device
37 46 46 20 Good 0
36 * * 20 Channel disabled 1
* 45 * 20 Fault indicated2 2
* 43 * 20 Fault, aeration indicated 3
* * 45 20 Spacing indicator
4
* * 43 20 Zeromatc channel fault 5
* * 42 20 Empty Pipe 6
* * 37 20 hi/lo flowrate 7
00 00 00 00 comm. Error 8
None of the above 111