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9 DEDICATED INSTRUCTIONS
MELSEC-Q
9.4 INPUT Instruction
Set data
(S)
(D1)
(D2)
Internal device
(System, user)
Bit
—
—
Word
This instruction receives data in any message format specified by the user using the non procedure protocol.
File register
Applicable device
MELSECNET/H,
MELSECNET/10
Direct J \
Bit Word
Special module
U \G
—
—
—
Index register Zn Constant Others
[Instruction code]
INPUT
[Executing condition]
Command
G.INPUT
Un (S) (D1)
(D2)
Set data
Set data
Un
(S)
(D1)
(D2)
Description
Start I/O signal of the module
(00 to FE: Top two-digit when I/O signals are expressed in 3-digit.)
Head number of the devices in which control data is stored.
Head number of the devices in which receive data is stored.
Bit device number to be turned on at completion of execution.
Set by
User
User, system
System
System
Data type
BIN16 bit
Device name
The file register per local device and program cannot be used as the set data.
Bit
Control data
Device
(S) + 0
(S) + 1
(S) + 2
(S) + 3
Item
Receive channel
Reception result
Receive data count
Allowable number of receive data
Set data
• Set receive channel
1: Channel 1 (CH1 side)
2: Channel 2 (CH2 side)
• Reception result by an INPUT instruction are stored.
0: Normal
Other than 0: Error code
1
• Receive data count is stored.
2
• Set the allowable number of words for received data that can be stored in (D1).
Setting range
1, 2
—
0 or more
1 or more
Set by
3
User
System
System
User
POINT
(1) The command of G.INPUT cannot be converted into pulse.
(2) G.INPUT should be executed while the read request of the input/output signal is turned on.
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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 program
END processing
END processing
Execution of INPUT instruction
INPUT instruction
END processing
END processing
Completion of reception by an INPUT instruction
ON
Completion device
OFF
ON
Abnormal completion
Status display device at completion
OFF
Normal completion
One scan
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9 DEDICATED INSTRUCTIONS
MELSEC-Q
Error
(1) When a dedicated instruction is completed abnormally, the abnormal completion signal (D2)+1, turns on and the error code is stored in the transmission result
(S1)+1.
In case of operation errors, the error flag (SM0) turns on and the error code is stored in SD0.
See one of the following manuals according to the error code, and check and correct the error.
<Error code>
4FFF
H
or less : QCPU(Q Mode) User's Manual
(Hardware Design, Maintenance and Inspection)
7000
H
or more: Section 10.2 of the User's Manual (Basic)
Program example
The following example shows a program that stores data received via the nonprocedure protocol in D10 and later.
When the input/output signals of the Q series C24 are from X/Y00 to X/Y1F:
Designate the receive channel.
Clear the reception result and receive data count storage device to 0.
Designate the allowable receive data count.
With normal completion, the receive data within the allowable receive data count (user designated) is read from the receive data storage area in the buffer memory.
• Once the INPUT instruction is executed, the user
designated read completion signal (M0) turns ON for
1 scan.
•
The reading of receive data and switching of the
ON/OFF status are performed by the PLC CPU.
The abnormal completion flag is reset by an external command.
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