I/O Refresh Instructions; I/O Refresh Instructions; I/O Refresh - Mitsubishi Electric MELSEC-Q/L Programming Manual

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I/O Refresh Instructions

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

Number of refreshes (BIN 16 bits)

Internal device

 (Only X, Y)

Processing details

• 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.

• 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.

• 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]

Operation error

• In any of the following cases, an operation error occurs, the error flag (SM0) turns ON, and an error code is stored into SD0.

Error details

The points specified in n exceed those of the proximate I/O.

6 BASIC INSTRUCTIONS

Redundant Universal

Direct access input

Refreshes X0

Refreshes Y20

Direct access output