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Posts posted by infringer

  1. Hi Everyone,

    I'm fairly new at all of this, I've done tons of computer work, alot of general electrical work, and a little electrical components work.  I'm trying to learn, and I've always felt the best way to learn is to actually solve a problem.

    Here's what I'm up against...  I need to control some water valves, based on particular input specifications.

    I have a IDEC Microsmart PLC, actual part number is FC4A-C24R2.  For those not familiar with it, Inputs are 24VDC, power to it is 110-240VAC, outputs seem to be 110VAC as well.

    I have no problems programming the unit, and no problems with the input side.  My problems seem to come in when I begin thinking about the output side.

    I'm needing to switch some 24VAC water valves, based on what is happening at certain inputs. 

    I have a couple ideas, I just want to throw them out and see what you guys think and maybe you can direct me in the correct direction.

    Idea #1) On the output side of the PLC, each section of outputs, has a common port where they get their power from.  What if I just supply 24VAC to the common port, then each of the output ports should in essence only put out 24VAC.  Right?  Maybe I am incorrect about this, please correct me if I am wrong.

    Idea #2) Do they make relays that are switched by 110VAC and actually switch 24VAC?  If so, then I can use this type relay to do the switching I need.

    I appreciate any help you can give me, and I am willing to follow anyone's direction on figuring this out.

    Thank you in advance, and I hope to learn alot.

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