14 DIVIDED DATA READ/WRITE FROM/TO BFM INSTRUCTION
14.1 Divided BFM Read
685
14
â– Related devices
• Do not stop the instruction while it is being executed. If driving is stopped, the buffer memory reading processing is
suspended, but the data that is already read is stored in (d) onwards. Stop the instruction after execution completes as in
the following program.
• When indexing is executed, the contents of index registers at the beginning of execution are used. Even if the contents of
index registers are changed after the instruction, such changes do not affect the process of the instruction.
• The contents of (n1) points starting from (d) update (change) every scan while this instruction is executed. Use the data
after the instruction is completed.
• Do not update (change) the contents of (n1) buffer memory areas starting from the buffer memory (s) while this instruction
is executed. If the contents are updated, the intended data may not be read.
• This instruction cannot be used in FX5 series intelligent function modules.
• This instruction cannot be used while a interrupt routine program is being executed.
Device Name Description
SM8029 Instruction execution complete Turns ON when an instruction is finished normally.
SM8328 Instruction non-execution Turns ON when the RBFM instruction or WBFM instruction in another step is executed for
the same module number.
SM8329 Instruction execution abnormal end Turns ON when an instruction is finished abnormally.
Error code
(SD0/SD8067)
Description
2441 Communication procedure with module is not completed correctly when this instruction is executed.
2801 Module with the module number specified by (U/H) does not exist.
2823 The number of transfer points specified by (n1) and the buffer memory number specified by (s) is beyond the buffer memory area range.
2820 The number of transfer points specified by (n1) and the device number specified by (d) is beyond the specified device range.
3580 Instructions that cannot be used in an interrupt routine program are being used.
SET
SM8029
RST
RBFM (U/H) (s) (n1) (n2)
M
M
M
(d)
Instruction execution complete flag
Command
input
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