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.
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