Action - Mitsubishi Electric MELSEC iQ-F Series Programming Manual

Action

An action is a program which is executed while a step is active.
Step1 S1
Transition1
TR1
Step2 S2
(1) Action name
*1
(2) Qualifier
(3) Detailed expression of the action
(4) Action label/device
*1 N indicates that the action is executed while a step is active. Nothing but N can be set.
When the step becomes active, the action is executed every scan. When the step becomes inactive, the action is ended and
not executed until next time the step becomes active.
Up to 4 actions can be created in one step. When multiple actions are created, they will be executed in order from the top.
The detailed expression of actions can be created in ladder, ST or FBD/LD language.
For details on detailed expression or labels/devices, refer to the following.
GX Works3 Operating Manual
Instructions that cannot be used
Some instructions cannot be used in actions. The following table lists the instructions that cannot be used.
Classification
Master control instruction
Termination instruction
Program branch instruction
Program execution control instruction
Structure creation instruction
Creating a dummy transition condition
Step ladder instruction
Initial state
*1 This instruction can be used in a function or a function block in the action.
8 SFC PROGRAM
84
8.2 Structure
(1) (3)
SM400
N Action0
(2)
N M20
(4)
N bLabel5
Instruction symbol
*1
MC
*1
MCR
FEND
END
*1
CJ
GOEND
IRET
*1
BREAK
RET
SRET
TRAN
STL
RETSTL
IST
bLabel2
MOV wLabel3 wLabel4