Is that "special" for a PLC? IDEC Does not make one? What is the Allen Bradly that has free software? Does it do 120vac inputs? Any good brands bundled with software you guys use?
Thanks
I really like the Click for basic stuff. 120v inputs are very common for plc's. If someone doesn't make one with 120v inputs they need to pull their head out....
It's not "special" for companies that market primarily to the North American market, then secondarily to the rest of the word. But for companies that make their products primarily for the rest of the world, then secondarily for North America, 120V inputs are expensive to develop and maintain based on what they consider to be a relatively low volume. Nobody outside of NA uses 120V for controls. People in IEC countries used to use 230V for controls, but recent changes in safety requirements have them all using 24VDC now for everything they can, so that includes PLCs.
Yeah IDEC is pretty sparce in the 120V I/O department. I think they have an 8 point 120 input module for the micro smarts now. Stuck with RO's for 120 outputs.
No, it means there is an actual tiny relay inside the I/O card wired to the terminals, as opposed to a solid state output, transistor (for DC only outputs) or triac (for AC outputs). The problem with using solid state outputs is that they can have "leakage" that can cause issues, and if they are switching anything inductive, like a coil, their current rating is very very low because of inrush and inductive kickback. Relays provide you with a real air gap isolation in the circuit and usually a little more current capacity. But solid state outputs can be much higher density, much higher speed and they don't wear out if you have a high duty cycle.
That is going to do more than I need. Thanks guys.
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