Primary Contents

• What are the symbols for NC and NO contacts?
• What is diversity?
• Why is the Safety Relay required for safety circuits?
• Why cannot Programmable Controller (PLC) or Programmable Terminal (PT) be used for safety circuits?
• Can an NPN Safety Light Curtain be connected to Control Unit F3SP-B1P?
• What is a positive common input?
• What is the difference between the Safety Relay and the Safety Relay Unit?
• Why are two inputs required for the Safety Relay Unit?
• What is the difference between an auto reset and manual reset?
• What is an inverse input?
• How does a forcibly guided contact work?
• For what purpose is the Safety Relay Unit provided with a feedback circuit?
• What is redundancy?
• What is the difference between the Safety Relay and the General Relay?