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3.7 Conditions for Execution of Instructions
3.7 Conditions for Execution of Instructions
The following four types of execution conditions exist for the execution of CPU module sequence
instructions, basic instructions, and application instructions:
• Non-conditional execution...... Instructions executed without regard to the ON/OFF status of
the device
LD X0, OUT Y10
• Executed at ON...................... Instructions executed while input condition is ON
MOV instruction, FROM instruction
• Executed at leading edge ...... Instructions executed only at the leading edge of the input
condition (when it goes from OFF to ON) Example
PLS instruction, MOVP instruction.
• Executed at trailing edge ....... Instructions executed only at the trailing edge of the input
condition (when it goes from ON to OFF) Example
PLF instruction.
For coil or equivalent basic instructions or application instructions, where the same instruction
can be designated for either execution at ON or leading edge execution, a "P" is added after the
instruction name to specify the condition for execution.
• Instruction to be executed at ON
• Instruction to be executed at leading edge + P
Execution at ON and execution at leading edge for the MOV instruction are designated as
follows:
Example
Example
Instruction name
Instruction name
MOVP K4X0 D0
Execution at leading edge
MOV K4X0 D0
Execution during ON