9-13
9.6 Precautions for Programming
Programs which are not executed correctly
Do not write the following programs as they will not be executed correctly.
<Example 1>
• When X1 was on prior to X0, Y0 will not be on even if X0 becomes on.
<Example 2>
• TMX will activate if X1 becomes on whether X0 is on or off.
<Example 3>
• When X2 was on prior to X0, Y1 will not be on even if X0 becomes on.
When a combination of contacts are set as the trigger (execution condition) of a differential instruction
(DF) or timer instruction, do not use an AND stack (ANS) instruction, read stack (RDS) instruction, or
pop stack (POPS) instruction.
Examples in which the above programs are rewritten
<Program in which the example 1 is rewritten>
<Program in which the example 2 is rewritten>
<Program in which the example 3 is rewritten>
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