Справочник Пользователя для Mitsubishi Electronics QCPU

6-141

RFS(P)

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.7 I/O 

Refresh Instructions

6

.7.1 I/O refr

esh (

RFS(

P

))

I/O Refresh Instructions

I/O refresh (RFS(P))

RFS(P)

Function

(1) 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.

: Head number of the devices to be refreshed (bits)

 n : Number of refreshes (BIN 16 bits)

Setting 

Data

Internal Devices 

R, ZR

J

\

U

\G

Zn

Constants

K, H

Other

Bit

Word

Bit

Word

 

(Only X, Y)

––

––

n

––

Command

Command

RFSP

RFS

n

n

S

S

RFSP

RFS

S

S

Command

K1

X0

Command

Y20

X0

RFS

K1

Y20

RFS

Direct access input

DY20

DX0

Direct access output

Refreshes X0

Refreshes Y20

[Program based on the RFS instruction]

[Program based on direct access input and direct access output]