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Distributed Safety : acknowledgment with a standard input

3/28/2013 12:27 PM	Rate (0)
pcadudal Posts: 5 Rating: (0)	Hello, My question is about programing with Distributed Safety. I tried to find a solution in existing posts, but can't find a clear answer. Is it legally allowed to create an acknowledgement (operator button) with non-safe input ? Please see attached picture. Best regards, Attachment Safe acknowledgment.jpg (319 Downloads)
pcadudal Posts: 5 Rating: (0)
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3/30/2013 12:40 PM	Rate (0)
Marko Bursic Posts: 1410 Rating: (154)	As farI know only doors, E-stop, light curtains, ....shall be safety inputs. Other inputs like feedback of contactors, start, ack,.. may be normal ones.
Marko Bursic Posts: 1410 Rating: (154)
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3/31/2013 7:47 PM	Rate (1)
yy1 Posts: 535 Rating: (112)	Dear pcdaudal, I agree with Markos opinion. Perhaps this link can help you. Best regards, yy1
yy1 Posts: 535 Rating: (112)
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4/8/2013 10:08 AM	Rate (0)
pcadudal Posts: 5 Rating: (0)	Thank you both for your answers ! With the passivation example from Siemens it is clear that a standard input can acknowledge an emergency stop (for example). This document will help me to explain customers why we have the right to do so... Safety managers are always afraid of standard inputs in safety programs ! Best regards,
pcadudal Posts: 5 Rating: (0)
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This contribution was helpful to 1 thankful Users yy1

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