I am a PLC novice and I am confused about choosing an output card for DC outputs. Unlike input devices which are clearly designed as sinking or sourcing all of the output devices I see (Solenoid Valves, motor starters) do not specify wether they are sinking or sourcing. Does the sink / source not really apply to outputs? I need to choose a DC output card that is either sinking or sourcing. Does it really matter, can I make any DC output device work on either type of board? Or should I just choose a relay type uutput board.
Any advice would be appreciated!
Any advice would be appreciated!