What is the purpose of the "STOP" button in a Siemens PLC? What is the purpose of Organization Blocks (OBs) in a Siemens PLC? What does "fail-safe mode" mean in the context of a Siemens PLC? What is the role of OB35 in a Siemens PLC? Which Organization Block (OB) in a Siemens PLC would handle program errors? Which Organization Block (OB) in a Siemens PLC would handle a hardware interrupt?

Question

Accepted Answer

The STOP button in a Siemens PLC is used to immediately halt the operation of the PLC.

The STOP button is a safety feature that allows operators to quickly stop the PLC in case of emergencies or malfunctions.
Pressing the STOP button will halt the execution of the program and prevent any further outputs from the PLC.
The STOP button is typically connected to a dedicated input on the PLC to ensure immediate response.

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