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Lead Contents

Emergency Stop Switch: Reason of PLC or Programmable Terminal Not Applicable for the Safety Circuit

FAQ No. FAQ02456

Primary Contents

Question

Why can't a Programmable Controller or Programmable Terminal be used for the safety circuit?

Answer

The IEC 60204-1 (JIS B 9960-1) standard specifies that a safety circuit cannot be made using a programmable controller alone. This comes from the general requirement of the same standard that safety related functions must be constructed from proven circuit technology and parts. If the circuit relies on the operation of programmable electronic devices, this requirement may not be satisfied.