Mitsubishi MELSEC-Q/L Programming Manual page 151

Function
(1) When the execution command is turned ON, the status of the designated devices becomes as shown below:
Bit device
Timers and counters
When Bit Designation has been Made for Word Device
Word devices other than timers and counters
(2) When the execution command is OFF, the status of devices does not change.
(3) The functions of the word devices designated by the RST instruction are identical to the following ladder:
Command
X10
RST
Operation Error
(1) There is no operation error in the RST instruction.
Remark
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 access output: 2
• Timer, counter: 4
• When using serial number access format file register
(Only for Universal model QCPU and LCPU): 2
(Basic Model QCPU, High Performance model QCPU, Process CPU, and Redundant CPU): 3
• Other than above: 3
b) For word processing
• Internal device: 2
• Index resister: 2
• When using serial number access format file register
(Only for Universal model QCPU and LCPU): 2
(Basic Model QCPU, High Performance model QCPU, Process CPU, and Redundant CPU): 3
• Other than above: 3
Program Example
(1) The following program sets the value of the data register to 0.
[Ladder Mode]
[List Mode]
Steps Instruction
Device
D50
Device number
Stores the contents at X10 to X1F in D8
when X0 is turned ON.
Resets D8 to 0 when X5 is turned ON.
Device
Device Status
Turns coils and contacts OFF
Sets the present value to 0, and turns coils and contacts OFF
Sets value of designated bit to 0
Sets contact to 0
Command
X10
MOV K0
RST
D50
Device number
1
2
3
4
5
6
7
8
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