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Steve M. Taylor
08/25/05 06:14
Read: 830 times
State College
USA


 
#100065 - safety systems
Responding to: Russell Bull's previous message
In some of our instruments, I subsume safety critical stuff to hardwired relay logic, or a Millenium II PLC. Mostly I am concerned with people not raising a certain part, spinning at 3000 RPM plus, out of its cell. There is a limit switch and a relay circuit. Raise the part and the motor goes off. Lower the part and the motor STAYS off, until a separate switch is cycled. This co-incidentally tells the 8052 system that the motor interlock is engaged. Also, when the mains is cycled, the instrument goes into interlock.

Steve

List of 12 messages in thread
TopicAuthorDate
EU legislations      J Cena      08/24/05 07:37      
   What an how..      José Félix Díaz Ivorra      08/24/05 08:18      
   Saferty critical      Steve M. Taylor      08/24/05 09:43      
   Indutrial machinary      J Cena      08/24/05 09:55      
      BSI      Andy Neil      08/24/05 11:01      
      bag of worms      Steve M. Taylor      08/24/05 11:03      
         IEC 61508      Russell Bull      08/25/05 03:06      
            safety systems      Steve M. Taylor      08/25/05 06:14      
               I recall      Erik Malund      08/25/05 07:03      
                  simce nobody ventured a guess, here it i      Erik Malund      08/26/05 12:53      
                     Only in America?      Andy Neil      08/26/05 13:32      
                        Here ?      Steve M. Taylor      08/26/05 14:54      

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