Omron SCARA YRCX Series, Programming Manual, Page: 167 / 506

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47 IF
Evaluates a conditional expression value, and executes the command in accordance with the conditions
47.1 Simple IF statement
Format
IF conditional expression THEN label 1 ELSE label 2
command statement 1 command statement 2
Explanation If the condition specified by the < conditional expression > is met (true), processing
jumps either to the < label 1 > which follows THEN, or to the next line after
< command statement 1 > is executed.
If the condition specified by the < conditional expression > is not met (false), the
following processing occurs:
1. Processing either jumps to the <
label 2 > specified after the ELSE statement, or to
the next line after < command statement 2 > is executed.
2. If nothing is specified after the ELSE statement, no action is taken, and processing
simply jumps to the next line.
• When the conditional expression used to designate the IF statement condition is a numeric
expression, an expression value other than "0" indicates a TRUE status, and "0" indicates a
FALSE status.
SAMPLE
’MAIN ROUTINE
*ST:
MOVE P,P0,P1
IF DI(20)=1 THEN *L1 ········· If DI (20) is "1", a jump to *L1
occurs.
DO(20)=1
DELAY 100
*L1:
IF DI(21)=1 THEN *ST ELSE *FIN
····················· If DI (21) is "1", a jump to *ST
occurs. If other than "1", a jump to
*FIN occurs.
*FIN:
HALT
MEMO