Mitsubishi MELSEC iQ-F FX5 series, Programming Manual, Page: 35 / 888

1 OVERVIEW
1.3 Execution Condition
33
1
1.3
Execution Condition
Types of execution conditions
The following are the five types of execution conditions of the instructions and functions of CPU module.
■
On
An instruction is executed during on. It is executed only while the precondition of the instruction is on. When the precondition
is off, the instruction is not executed.
■
Rising edge
An instruction is executed one time when turned on. It is executed only once on the rising edge (off to on) of the precondition
of the instruction and is no longer executed later even when the condition turns on.
■
Off
An instruction is executed during off. It is executed only while the precondition of the instruction is off. When the precondition
is on, the instruction is not executed.
■
Falling edge
An instruction is executed one time when turned off. It is executed only once on the falling edge (on to off) of the precondition
of the instruction and is no longer executed later even when the condition turns off.
■
Always
An instruction is always executed regardless of whether the precondition of the instruction is on or off. When the precondition
is off, the instruction performs off processing.
Execution condition of each instruction
The execution condition varies depending on the instruction. The following table lists the execution conditions of individual
instructions.
Execution condition Applicable instruction
On All instructions except for the following
Rising edge • Instruction followed by symbol (P)
• PLS
Off -
Falling edge PLF
Always LD, LDI, AND, ANI, OR, ORI, LDP, LDF, ANDP, ANDF, ORP, ORF, LDPI, LDFI, ANDPI, ANDFI, ORPI, ORFI, ANB, ORB, MPS,
MRD, MPP, INV, MEP, MEF, OUT, OUT T, OUTH T, OUTHS T, OUT ST, OUTH ST, OUTHS ST, OUT C, OUT LC, MC, MCR, FEND,
END, NOP, LD

, AND

, OR

, LD

_U, AND

_U, OR

_U, LDD

, ANDD

, ORD

, LDD

_U, ANDD

_U, ORD

_U, JMP, DI,
EI, IMASK, SIMASK, IRET, FOR, NEXT, RET, LD$

, AND$

, OR$

, LDE

, ANDE

, ORE

, STMR, LDDT

, ANDDT

,
ORDT

, LDTM

, ANDTM

, ORTM
