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When using a light curtain with two safety outputs, may I use one for safety and one for annunciation (e.g. to send a signal to my PLC that the light curtain has been interrupted)?

April 26, 2017annunciation curtain interrupted light outputs Plc safety send signal

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When using a light curtain with two safety outputs, may I use one for safety and one for annunciation (e.g. to send a signal to my PLC that the light curtain has been interrupted)?

1 Answer

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The answer depends on the safety category desired, as well as other elements in the safety system. For higher safety categories (Category 3 or 4) dual (redundant) safety outputs are needed to satisfy control reliability requirements. For such applications the answer is no.