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Steve M. Taylor
08/25/05 06:14
Read: 855 times
State College

#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.


List of 12 messages in thread
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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