Rockwell Automation 9301 Series RSView32 Users Guide - Manual (Page 524)

Creating expressions
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14–11
Relational operators
Relational operators compare two numeric or string values to provide
a true or false result. If the statement is true, a value of 1 is returned. If
false, 0 is returned.
The relational operators are:
How string operands are evaluated
String operands are evaluated by case and by alphabetical order. Upper
case letters are greater than lower case letters. For example, H is
greater than h. Letters later in the alphabet are greater than those
earlier in the alphabet. For example, B is greater than A.
Symbol Operator Numeric Examples 1 String Examples 2
1 For the numeric examples, tag1 = 5 and tag2 = 7
2 For the string examples, serial_no = ST009
EQ, == equal tag1 == tag2
false serial_no == “ST011”
false
NE, <> not equal tag1 <> tag2
true serial_no <> “ST011”
true
LT, < less than tag1 < tag2
true serial_no < “ST011”
true
GT, > greater than tag1 > tag2
false serial_no > “ST011”
false
LE, <= less than or equal to tag1 <= tag2
true serial_no <= “ST011”
true
GE, >= greater than or equal to tag1 >= tag2
false serial_no >= “ST011”
false