I see several comments warning you about how a lack of knowledge will turn you into a crispy critter whose survivors will lament the low amount of life insurance you have purchased. From what I am able to glean from your posts, here is how you should set your system up for playing around.
First, take the terminal screws out of the PSU's 24VDC supply and throw them away. Buy a 1 amp 24VDC power supply and use that to supply any external devices with that. Next, get a 8 point isolated relay output card for the PLC rack. Your input card will need to be compatible with your inputs (24VDC or 120VAC). Get some small control relays (ice cube or some other type) and power them through your relay card. Apply power to your solenoids, lamps, etc, through the contacts on the control relays.
Once you have done this, you can program your PLC to manipulate the outputs at little risk to yourself and the equipment. Good luck.