A Fresh Engineer (Customer) asked a question.
Can someone tell me the difference between these inputs and out output devices? How many of them are AC and how many of them are DC? How do these sensors and transducers connect to the plc? I need to see what type of click I need for the devices that I will be using for my project, and also what addons do I need. I know for sure that I will need an analog output addon and an analog input, but I am not 100% sure. Here are all the devices I will be using for this project.
5.https://www.grainger.com/product/REDHAT-Solenoid-Valve-1-4-in-Pipe-6WTT0
I might add one or 2 more solenoid valves. Not sure how much power the solenoid needs, I know the transducer and transmitter use 4-20 mA as their output/input signal so I will need to somehow transfer the analog signal back to psi, and vice versa.
I typically try to design Click PLC panels where everything on the PLC is DC (24 volts for discrete inputs and outputs) and where I need to drive anything other than LED lamps, I use interposing relays that are cheap and plug into a base.
In general, don't try to drive solenoids directly with Click outputs unless you use relay outputs and then, if something goes wrong and damages that relay, you get to replace the card or the PLC whereas if you use interposing relays, after you fix the problem, you snap a new relay in the socket for about $8 and you're back up and running.
Using solid state PLC I/O means that they can last literally forever as long as there are no faults in the wiring between the I/O and the interposing relays.
I fuse analog inputs to protect the sensitive 4-20mA inputs but I don't typically fuse analog outputs or discrete 24vdc inputs unless it is a large panel and I want to segregate groups of inputs.
Your pressure switch has a transistor output, so technically not a switch, but can still be wired directly to a PLC input.
Your pressure transmitter is 4-20mA and I would use a 32mA fuse in series with its output signal to the PLC analog input.
I would use a PLC DC output to a relay to control the 120vac red hat valve. My favorite relays are Omron G2R series, but Idec are nearly as good and A/D sells relays that will work just fine too.
For analog input fuses:
https://www.automationdirect.com/adc/shopping/catalog/circuit_protection_-z-_fuses_-z-_disconnects/fuses/small_dimension_electronic_glass_fuses/s500-32-r
https://www.automationdirect.com/adc/shopping/catalog/terminal_blocks/dinnector_din-rail_terminal_blocks/circuit_protection_blocks/dn-f10mn
In the Click programming software, at the top go to, Setup > CPU Built-in I/O Setup > Input & Output tabs to configure scale ranges.
The C0-12DRE-1-D sounds good as far as the analog I/O is concerned, it seems to have conventional sourcing current outputs, some of the older analog models (such as the C0-02DD2-D have sitting next to me) have a somewhat odd sinking output that is harder to interface to some devices, but again the C0-12DRE-1-D does not have that problem. Personally I avoid relay CPUs, and if the load requires relays, use interposing relays or if space is a problem, relay expansion modules that are less expensive to replace that the whole CPU.
The Click power supply works fine and looks nice in the stack, but I think they are overpriced and almost always use a RIHNO power supply. While it is recommended to use a separate power supplies for the CPU and I/O, in practice it is quite common to only have one and the C0--00AC is only 500mA which doesn't leave a lot to spare. For about the same price one can (at least when they are not backordered) get a 3A PSV5-15S though I guess an advantage of the C0-00AC is that it is in stock, so starting there and IF needed add another supply for I/O might be the way to go.
I'd use the Click Plus C2-03CPU and C2-08D2-6C combo card, but what Todd recommends is fine, just that it has relay outputs and my personal preference is solid state with interposing relays.
Yeah, I went with the relay model because OP is using a 120VAC valve, and I don't know their budget or space constraints. OP could go with a C0-12DD2E-1-D CPU and an C0-08TA expansion module and avoid relay output altogether.