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  1. C

    Using sensor output via relay to trigger a solenoid

    Thanks Harald - The SW update drives a SW validation requirement which would prove to be cumbersome. The HW change will be documented and tested and the paperwork is less painful then the SW alternative. I will look into the monoflop as an option as well (EHS might not like to see a Safety relay...
  2. C

    Using sensor output via relay to trigger a solenoid

    Ta fios agaibh - Would this work - Only 2 scenarios for the cooling to come on - Normal Auto Mode - PLC O/P A goes ON, energizes A1/A2 on R1 - CAUSES 24VDS on NO CONTACT to be sent to the coil on K6 and trigger the cooling cycle Recovery Mode - PLC O/P A Does NOT go ON but PLC O/P B does go...
  3. C

    Using sensor output via relay to trigger a solenoid

    Here is a little bit more of my idea. Black is original and RED are my add ons R1 and R2 and T1 are added. I can swap over the 2 signals to give priority to the current auto signal as this comes on first theoretically - If it does not come on because of fault then the second one will kick in...
  4. C

    Using sensor output via relay to trigger a solenoid

    A little bit more complicated than the title - here are the complications. The System involves a cylinder extending a metal target holding process parts into a hot zone for a defined period of time. This movement is triggered by 2 hand control system which is monitored by Safety relays until...
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