Mitsubishi MELSEC Q Series Programming Manual page 347

6.7
I/O Refresh Instructions
6.7.1
I/O refresh (RFS(P))
RFS(P)
RFS
RFSP
Setting
Data
S
n
Function
(1) Refreshes only the device being scanned during a scan, and functions to fetch input from
external sources or to output data to an output module.
(2) Fetching of input from or sending output to an external source is conducted in batch only
after the execution of the END instruction, so it is not possible to output a pulse signal to an
outside source during the execution of a scan.
When the I/O refresh instruction is executed, the inputs (X) or outputs (Y) of the
corresponding device numbers are refreshed forcibly midway through program execution.
Therefore, a pulse signal can be output to an external source during a scan.
(3) Use direct access inputs (DX) or direct access outputs (DY) to refresh inputs (X) or outputs
(Y) in 1-point units.
[Program based on the RFS instruction]
[Program based on direct access input and direct access output]
Command
Command
: Head number of the devices to be refreshed (bits)
S
n : Number of refreshes (BIN 16 bits)
Internal Devices
R, ZR
Bit Word
(Only X, Y)
Command
RFS X0
X0
Command
RFS Y20
DX0
Direct access input
High
Basic
performance
RFS
RFSP
J \
U \G
Bit Word
––
K1 Refreshes X0
Y20
K1 Refreshes Y20
DY20
Direct access output
RFS(P)
Process
Redundant Universal LCPU
n
S
n
S
Constants
Zn Other
K, H
––
––
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