5-3. Description of Basic Instructions
Basic Instruction Reference
100
5-3. Description of Basic Instructions
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:
Timer/Counter
Contact
C
Relay
TRYX
Instruction
ST, ST/
OT
AAA A A
N/A A A N/A N/A
ON
OFF
X0
ON
OFF
Y0
ON
OFF
X1
ON
OFF
Y1
• 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.
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
A: Available
N/A: Not Available
Instruction name
Ladder diagram on
the screen using
NPST-GR Software
Available operands
for instruction
Explanation of
program example and
description of
instructions
Boolean (non-ladder)
with NPST-GR Software
Number of steps for instructions
Available unit type
Key operation of
FP Programmer II
Time chart of
program example
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