9 DEDICATED INSTRUCTIONS

MELSEC-Q

1 For error codes relating to abnormal completion, see Chapter 10 of the User's Manual (Basic).

2 When setting "Word/byte units designation" by GX Configurator-SC, set the number of bytes when bytes are designated and set the number of words when words are designated.

3 The settings are done by either of the following:

•User: Data set by the user before executing the INPUT instructions.

•System: The PLC CPU stores the execution result of the INPUT instructions.

Function

(1)The function stores in the device designated in (D1) and succeeding devices the data received with the non procedure protocol of the module designated in Un, according to the control data of the device designated in (S) and succeeding devices.

(2)When an INPUT instruction is executed on a channel, other INPUT instructions cannot be executed on the channel at the same time.

If an attempt is made during execution of an INPUT instruction to execute another INPUT instruction, the second instruction will not be executed until the execution of the first INPUT instruction is completed.

(3)In case of reading the receive data to the same interface, it cannot be used along with BUFRCVS instruction (for interrupt programs).

(4)Whether an INPUT instruction was completed normally or abnormally can be checked by the completion device ((D2)) or status display device at completion ((D2)+1).

(a)Completion device: Turns on at the END processing of the scan where the INPUT instruction is completed, and turns off at the next END processing.

(b)Status display device

at completion

 

: Turns on and off depending on the completion status

 

 

 

of the INPUT instruction.

 

 

 

 

 

 

 

 

• Normal completion

: Off with no change.

 

 

 

• Abnormal completion: Turns on at the END

 

 

 

 

 

 

 

 

processing of the scan where

 

 

 

 

 

 

 

 

the INPUT instruction is

 

 

 

 

 

 

 

 

completed, and turns off at

 

 

 

 

 

 

 

 

the next END processing.

[Operation during execution of an INPUT instruction]

 

 

 

 

 

 

 

 

 

 

Sequence

END

 

 

END

END

 

END

processing

 

 

processing

processing

processing

program

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Execution of INPUT

 

 

 

Completion of reception by

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

instruction

 

 

 

an INPUT instruction

INPUT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

instruction

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ON

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Completion device

OFF

 

 

 

 

 

 

 

 

Abnormal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ON

completion

Status display device

OFF

 

 

 

 

 

 

 

 

 

 

 

 

 

at completion

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Normal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

completion

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

One scan

 

 

 

 

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