Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 1042

Processing details
• This instruction refreshes only the relevant device during one scan, and imports external inputs or outputs data to the
output module.
• The instruction imports external inputs and outputs data to the outside altogether only after execution of the END instruction
of the program, and therefore cannot output pulse signals to the outside during one scan. When executed, the I/O refresh
instruction forcibly refreshes the relevant input (X) and output (Y) during program execution and therefore can output pulse
signals to the outside during one scan.
• To refresh the input (X) or output (Y) in units of points, use the direct access input (DX) or direct access output (DY).
Ex.
When a program using the RFS instruction is changed to a program using direct access input/output
RFS
X0
RFS
DX0
(3)
(1)Refresh X0.
(2)Refresh Y20.
(3)Direct access input
(4)Direct access output
Operation error
Error code Description
(SD0)
2820H The range of (n) points from the device specified by (s) exceeds the range of the proximal I/O.
7 APPLICATION INSTRUCTIONS
1040
7.27 Module Access Instructions
(1)
X0 K1
Y20
(2)
K1
Y20
DY20
(4)