Automating Manufacturing Systems - Process Control and ...

plc function ref - 34.41
ASC - Ascii string Search for Character
A
ASC
STRING SEARCH
Source ST9:0
Index 20
Search ST9:1
Result
Description:
This function will search a string for a character. In this example the
character will look for the character in string ’ST9:0’ in position 20
(21st) in string ’ST9:1’. If a match is NOT found the bit ’S2:17/8’ will
be turned on.
Status Bits:
Registers:
S2:17/8
none
ascii minor fault bit - this bit will be set if there was no match
Available on: Micrologix, PLC-5
ASR - Ascii StRing compare
A
ASR
ASCII STRING COMPARE
SourceA ST10:10
SourceB ST10:11
X
Description:
This instruction will compare two strings. In this example, if ’A’ is true
then the strings ’ST10:10’ and ’ST10:11’ will be compared. If they are
equal then ’X’ will be true, otherwise it will be false. If the strings are
different lengths then the bit ’S2:17/8’ will be set.
Status Bits:
Registers:
S2:17/8
none
ascii minor fault bit - this bit will be set if the string lengths
don’t match.
Available on: Micrologix, PLC-5
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