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MELSEC-Q/QnA
5 SEQUENCE INSTRUCTIONS
High Performance
QnA Q4AR
Basic
QCPU
PLC CPU
Process CPU
5.3.6 Resetting devices (except for annunciators) (RST)
Usable Devices
Internal Devices
(System, User)
MELSECNET/10(H)
Direct J
\
Other
Set
Data
Bit Word
File
Register
Bit Word
Special
Function
Module
U
\G
Index
Register
Zn
Constant
K, H
BL DY
D
[Instruction Symbol] [Execution Condition]
RST input
RST
D
RST
[Set Data]
Set Data Meaning Data Type
Bit device number to be reset/ Word device bit designation Bit
D
Word device number to be reset BIN 16 bits
[Functions]
(1) Designated devices respond as follows when RST input is turned ON:
Device Device Status
Bit device Turns coils and contacts OFF
Timers and counters
Sets the present value to 0, and turns coils and contacts
OFF
When bit designation has been made for word
device
Sets value of designated bit to 0
Word devices other than timers and counters Sets contact to 0
(2) Device status does not change when RST input goes OFF.
(3) The functions of the word devices designated by the RST instruction are identical to the
following ladder:
X10
D50
RST
X10
D50
K0MOV
RST input
RST input
Device No.
Device No.
[Operation Errors]
(1) There are no operation errors associated with the RST instruction.
REMARK
1) The basic number of steps of the RST instruction is as follows.
a) For bit processing
• Internal device (bit to be specified by bit device or word device) : 1
• Direct output : 2
• Timer, counter : 4
• Other than above : 3
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