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manual wiring for Emergency end limit

6/3/2011 8:47 PM	Rate (0)
ŠΜS Silver Member Joined: 6/7/2010 Last visit: 7/9/2024 Posts: 571 Rating: (37)	Hi to all, I dont know is it correctto post this General Questiones here.But i know , i will get an correctand best answers & suggesions. Ok my questine is Why in most of the CNC machinesEmergency end limit & Emergency stop is wired manually( hardware wiring,not through input). I came across 5 to 6 machines same type of wiring is done in all the machines forE stop.For example : a machine has 4nos of E stop Push button in varies place of machine, in that all E stopare wired in series at last it is given inone input. Same as for EmergencyEnd limit wired parallely with an Bypass push button .When Emergency limit hit , itSwitchON theRelay for E stop. Could any onetell me the reason for manual wiring, why not throughDigital inputs?Is there any advantages in that.
	Regards, ŠΜS
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6/3/2011 9:03 PM	Rate (0)
umencho Diamond Member Joined: 3/21/2006 Last visit: 3/30/2025 Posts: 10239 Rating: (1183)	Hello, Basically the idea is to cover the standarts. Check it - ISO 13850 Safety of machinery - Emergency stop - Principles for design http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=39078 best regards, Hristo Mihalev

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This contribution was helpful to 1 thankful Users ŠΜS

6/5/2011 3:44 PM	Rate (0)
PISCEAN 2010 Diamond Expert Joined: 4/23/2010 Last visit: 11/23/2024 Posts: 8092 Rating: (882)	Ok. But again the question is, why it is not connected as NC input? May be my question is silly one, but then it must be having reason that we want to know.

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6/7/2011 12:22 PM	Rate (0)
Pee El Sea Gold Member Joined: 1/19/2008 Last visit: 4/16/2025 Posts: 997 Rating: (64)	Hi, The short answer is that where possible we do not trust safety to computers and software. I certainly wouldn't trust my life with my plc program or a single computer processor. Hence Siemens safety integrated double checks everything. Hard wired is generaly seen as more reliable. Pee

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This contribution was helpful to 1 thankful Users PISCEAN 2010

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