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9 DEDICATED INSTRUCTIONS
MELSEC-Q
9.8 CSET (Receive data clear)
Set data
(S1)
(S2)
(D1)
(D2)
Bit
—
—
—
Internal device
(System, user)
Word
File register
Bit
Applicable device
MELSECNET/H,
MELSECNET/10
Direct J \
Word
Special module
U \G
—
—
—
—
Index register Zn Constant Others
K, H —
[Instruction code]
CSET
[Executing condition]
[Instruction form]
ZP.CSET
"Un" (S1) (S2) (D1) (D2)
Set data
Set data
"Un"
(S1)
(S2)
(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.)
Number of the channel that demands to clear receiving data.
1: Channel 1 (CH1 side)
2: Channel 2 (CH2 side)
Head number of the device that stores the control data.
Set by
User
Dummy
Head number of the bit device at the self-station that turns on for one scan at the completion of the instruction.
(D2) + 1 also turns on at an abnormal completion.
User, System
—
System
Data type
BIN16 bit
Device name
Device name
Bit
Each of file registers for local device and program cannot be used as the setting data.
Control data
Device
(S2) + 0
(S2) + 1
(S2) + 2
(S2) + 3 to
(S2) + 111
Item
Execution type
Complete status
Request type
For system
Set data
Select 0.
The execution result at the completion of the instruction is stored.
0: Normal
Other than 0: Abnormal (error code)
Specify the request.
4: Receive data clear request
Setting range
0
—
4
— —
Set by
User
System
User
System
REMARK
(1) See the "Error" explanation on the following page for details on errors caused by wrong data specifications by the user.
(2) The setting sides are partitioned as follows:
• User: Data set by the user before executing the dedicated instruction.
• System: The PLC CPU stores the execution result of the dedicated instruction.
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9 DEDICATED INSTRUCTIONS
MELSEC-Q
Function
Sequence program
CSET instruction
Complete device
Complete device+1
Q series C24
Error
(1) This function clears reception data in the OS area. It does not clear the user data reception area in the buffer memory.
(2) If the CSET instruction is executed while the read request (X03/X0A) or reception abnormal detection signal (X04/X0B) is turned on, the CSET instruction is kept waiting until the signal is turned off.
(3) The status of the CSET instruction, whether it is being executed or completed normally/abnormally, can be checked by the complete device (D2) specified by the setting data.
(a) Complete device ((D2) + 0)
This device turns on at the End processing of the scan at which the CSET instruction is completed and turns off at the next End processing.
(b) Complete device ((D2) + 1)
It turns on/off by the status at which the CSET instruction is completed.
• At normal completion: It is kept turned off and does not change.
• At abnormal completion: It turns on at the END processing of the scan at which the CSET instruction is completed and turns off at the next END processing.
[Operation at execution of CSET instruction]
Scan
End processing
Scan
End processing
Scan
Execution of instruction
End processing
Setting processing
At abnormal completion
(1) If the dedicated instruction is abnormally completed, the error flag (SM0) turns on and the error code is stored in SD0.
See the following manuals according to the error code, and check/take action according to the error.
<Error code>
4FFF
H
or less : QCPU User's Manual
(Hardware Design, Maintenance and Inspection)
7000
H or more: Section 10.2 of the User's Manual (Basic)
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9 DEDICATED INSTRUCTIONS
MELSEC-Q
Program example
This is an example of a program that clears reception data on the Q series C24 side.
It is assumed that the input/output signals of the Q series C24 are X/Y00 to X/Y1F.
Set the execution type
Set the request type
(Reception data clear)
Execute the reception data clear
Normal completion
Abnomal completion
Reset the complete flag by external command
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