Rockwell Automation 1398-PDM-xxx IQ Master Version 3.2.4 for IA-2000 and IQ-5000 Positioning Drive Modules, IQ-55 - Manual (Page 167)

IQ Programming Structure • Program Structure Instructions 145
Publication 1398-PM601A-EN-P — October 2000
TUTORIAL
IF/ELSE Structure
The IF/ELSE statement is used to execute an instruction or a block of instructions one time if a condi-
tion is true and a different instruction or block of instructions if the condition is false. The simplified
syntax for the IF/ELSE instruction is:
IF condition
{
…
conditional statements
}
ELSE
{
…
conditional statements
}
Refer to Part 5
•
Language Reference for more detailed information. The following flowchart and code
segment illustrate the use of the IF/ELSE instruction.
WAIT Statement
The WAIT statement is used to suspend program execution until a condition is true. The simplified syn-
tax for the WAIT statement is:
WAIT condition
Refer to Part 5
•
Language Reference for more detailed information.
ON Structure
The ON instruction is used for multiple dimensional branching. The program can branch to as many dif-
ferent labels as required based on the value of a variable. Refer to Part 5
•
Language Reference for more
detailed information.
…
statements
If I1 = ON
{
O2 = OFF
MOVD = 3
}
ELSE
{
O2 = ON
MOVD = 4
}
…
statements
Is input 1 ON?
Start
Yes
No
Output 2 OFF
Move Distance 3 inches
End
Output 2 ON
Move Distance 4 inches