Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 1440

Processing details
• This instruction switches the SFC control instruction target block No. of the step (specified by S) to the block No. specified
by (s).
• The effective range of the instruction is as follows depending on the execution program type.
• Sequence program: The block is switched from the point where the instruction is executed to the start of the SFC program. In the next scan, the target block
will be the block 0 (default) until the instruction is executed again.
• SFC program: The block is switched only within the step being executed. Even when the same step is targeted, the instruction must be executed for each
block where the instruction specified by S is used. Moreover, even within a single step, the block is switched only from the point where the instruction is
executed to the END processing of the step. In the next program, the target block will be the current block (default) until the instruction is executed again.
0
Execution program
Target block
(1) END processing is not performed.
• If the block No. is specified by BL\S, the block No. is switched with or without execution of the instruction.
• The instruction is valid only for the target step. If multiple steps are active in such as a simultaneous sequence, the
instruction needs to be executed for each step.
Operation error
Error code Description
(SD0)
31A1H The specified block does not exist, or the SFC program is in a standby state.
The instruction is executed when no SFC program (scan execution type) exists or SM321 is off.
31A2H The specified block No. is out of the range, 0 to 319.
13 SFC PROGRAM INSTRUCTIONS
1438
13.1 SFC Control Instructions
Sequence program
A END instruction
Execution of
(1)
the instruction
Block specified by the
0
instruction
Repeated
Sequence program
B END instruction
Execution of
(1)
the instruction
Current block
Block specified
by the instruction
1 scan
SFC program
Block n
Execution of Execution of
the instruction the instruction
Current block
Block specified
by the instruction
Block (n+1)
Block specified
by the instruction
END
processing