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???
03/04/04 11:59
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#65925 - RE: Solenoid operated Pneumatic valves
Responding to: ???'s previous message
Sounds like you got the common problems covered. The optos between the micro and the uln2803 driving the relay is probably a bit excessive. The average industrial PLC has optos on the inputs but none on the outputs. The usual diode across the relay coil is usually sufficient - unless the relay is a big one!

You'll probably also find the solid state relays will work fine also - make sure they're zero volt switching (most are) as these will turn on or off only on a zero crossing of the mains.

List of 23 messages in thread
TopicAuthorDate
Solenoid operated Pneumatic valves            01/01/70 00:00      
   RE: Solenoid operated Pneumatic valves            01/01/70 00:00      
   RE: Solenoid operated Pneumatic valves            01/01/70 00:00      
      RE: Solenoid operated Pneumatic valves            01/01/70 00:00      
   RE: Solenoid operated Pneumatic valves            01/01/70 00:00      
      Solenoid operated Pneumatic valves            01/01/70 00:00      
         RE: Solenoid operated Pneumatic valves            01/01/70 00:00      
   RE: Solenoid operated Pneumatic valves            01/01/70 00:00      
      RE: Solenoid operated Pneumatic valves            01/01/70 00:00      
      RE: Solenoid operated Pneumatic valves            01/01/70 00:00      
         RE: Solenoid operated Pneumatic valves            01/01/70 00:00      
            RE: Solenoid operated Pneumatic valves            01/01/70 00:00      
         RE: Solenoid operated Pneumatic valves            01/01/70 00:00      
   RE: Solenoid operated Pneumatic valves            01/01/70 00:00      
   First Things First            01/01/70 00:00      
      RE: First Things First            01/01/70 00:00      
   PS/2 Keyboard near Welding area.            01/01/70 00:00      
      RE: PS/2 Keyboard near Welding area.            01/01/70 00:00      
      RE: PS/2 Keyboard near Welding area.            01/01/70 00:00      
         RE: PS/2 Keyboard near Welding area.            01/01/70 00:00      
         RE: PS/2 Keyboard near Welding area.            01/01/70 00:00      
            RE: PS/2 Keyboard near Welding area.            01/01/70 00:00      
   RE: Solenoid operated Pneumatic valves            01/01/70 00:00      

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