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5  SEQUENCE INSTRUCTIONS
5.3  Output Instructions
161
5
Resetting devices (excluding annunciators)
RST
When BL, S, TR, BL\S, or BL\TR is used, refer to SFC control instructions of the MELSEC-Q/L/QnA 
Programming Manual (SFC).
When F is used, refer to the Page 163 Setting annunciators, resetting annunciators.
Processing details
 • When the execution command is turned ON, the status of the designated devices becomes as shown below:
 • When the execution command is OFF, the status of devices does not change.
 • The functions of the word devices designated by the RST instruction are identical to the following ladder:
 • The number of basic steps for the RST instruction is as follows.
(D):   Bit device number to be reset/ Word device bit designation (bits) Word device number to be reset (BIN 16 bits)
Setting 
data
Internal device
R, ZR
J\
U\G
Zn
Constant
Others
DY
Bit
Word
Bit
Word
(D)
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
For bit processing
Number of 
basic steps
Internal device (bit to be specified by bit device or word device)
1
Direct access output
2
Timer, counter
4
When using serial number access format file register
Universal model QCPU and LCPU
2
Basic model QCPU, High Performance model QCPU, Process 
CPU, and Redundant CPU
3
Other than above
3
For word processing
Number of 
basic steps
Internal device
2
Index register
2
When using serial number access format file register
Universal model QCPU and LCPU
2
Basic model QCPU, High Performance model QCPU, Process 
CPU, and Redundant CPU
3
Other than above
3
Basic
Process
High
performance
Redundant Universal
LCPU
Command
RST
D
RST
X10
D50
RST
X10
D50
K0
MOV
Command
Command
Device number
Device number