Omron SCARA YRCX Series, Programming Manual, Page: 86 / 506

7-8 Chapter 7 Sequence function
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4.5 Priority of logic operations
Priority Ranking Operation Content
1 Expressions in parentheses
2 NOT, ~ (Logical NOT)
3 AND, & (Logical AND)
4 OR, | (Logical OR)
5 XOR (Exclusive OR)
6 EQV (Logical equivalence operator)
7 IMP (Logical implication operator)
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Example with a ladder statement substitution
SAMPLE
DO(23)=DI(16)&DO(35)
MO(34)=DO(25) | ~DI(24)
DO(31)=(DI(20) | DO(31))&~DI(21)
Ladder diagram
DI(16)
DO(25)
~DI(24)
DI(20)
DO(31)
DO(35)
~DI(21)
DO(23)
MO(34)
DO(31)
(Self-hold circuit)
33702-R7-00
• "NOT" cannot be used prior to the first parenthesis " ( " or on the left of an expression. For
example, the following commands cannot be used.
•DO(21)=~(DI(30) | DI(32))
•~DO(30)=DI(22)&DI(27)
• Numeric values cannot be assigned on the right of an expression.
•MO(35)=1
•DO(26)=0
• There is no need to define a "HALT" or "HOLD" statement at the end of the program.
• The variables used in sequence programs are shared with robot programs, so be careful not to
make improper changes when using the same variables between them.
4.6 Sequence program specifications
Item Specification
Commands Logical NOT, AND, OR, XOR, EQV, IMP
I/O Same as robot language
Program capacity 16,384 bytes (A maximum of 2,048 variables can be specified.)
Scan time 1 to 4ms depending on the number of steps (This changes
automatically.)
MEMO