5-3. Description of Basic Instructions
101
Outline
ST: Begins a logic operation with a Form A (normally open) contact.
ST/: Begins a logic operation with a Form B (normally closed) contact.
OT: Outputs the operated result to the specified output.
Program example
■
Operands
■
Time chart
■
Explanation of example
• Y0 goes ON when X0 turns ON.
• Y1 goes ON when X1 turns OFF.
Description
• The
ST
instruction starts logic operations and regards the input contact specified at the start as
Form A (normally open) contact.
• The
ST
/
instruction starts logic operations and regards the input contact specified at the start as
Form B (normally closed) contact.
• The
OT
instruction outputs the operation result to a specified coil.
Notes:
• The
ST
and
ST
/
instructions start from the bus line.
• Some input devices such as emergency stop switch usually have the Form B (normally closed) contact.
When an emergency stop switch with the Form B contact is programmed as input to the FP1, use the
ST
instruction instead of the
ST
/
instruction.
• The
OT
instruction cannot start directly from the bus line.
• The
OT
instruction can be used consecutively.
• Refer to page 141, “3. Duplicated Use of Outputs”, for details about duplicate output of the
OT
instruction.
ON
OFF
X0
ON
OFF
Y0
ON
OFF
X1
ON
OFF
Y1
Timer/Counter
Contact
C
Relay
T
R
Y
X
Instruction
ST, ST/
OT
A
A
A
A
A
N/A A
A
N/A
N/A
FP Programmer
II
key operations
ST
Start
ST/
Start Not
OT
Out
Availability
Step
1
1
1
All series
Ladder Diagram
Boolean Non-ladder
Address Instruction
0
X0
Y0
Out
Start
2
X1
Y1
Out
Start Not
ST
X-WX
ST
X-WX
ST
X-WX
0
WRT
OT
L-WL
0
WRT
AN
Y-WY
NOT
DT/Ld
1
OT
L-WL
AN
Y-WY
1
WRT
WRT
ST
X-WX
0
1
2
3
ST
X
0
OT
Y
0
ST/
X
1
OT
Y
1
X0
Y0
Bus line
Y1
Y2
A:
Available
N/A: Not Available
Содержание FP1
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