Hi,

I am new to PLC's. I have read many of the online PDF, websites, and found this site via Utube.

I want to setup a SLC 500 5/03 to do some logic for outputing to a device ( relay 1746-OW16 ) maybe?

What the input device will be is a Proface 577R panel LCD box. There will be 64 buttons assigned to on when pushed, off when released. One shot push is fine.

The output of this to the SLC 500 will become my matrix logic.

I have 8 inputs X0-X7, and 8 inputs Y0-Y7 ... any combination of these at reference closed switch creates an output to the respective pins on a motherboard.

X0 Y0

X1 Y1

X2 Y2

------

X7 Y7

X0 Y0 = Start

X0 Y1 = Coolant

X0 Y2 = Tool in

Like that... Now, my thought was 64 relays. Each relay creates a complete circuit and I get signal at the motherbroad. Then I thought, well I should only need 16 relays and get the logic worked out in the PLC for 64 inputs, and output to 16 relays that sets up the logic.

X0 Y1 X1 Y1 X2 Y1 X3 Y1

X0 Y2 X1 Y2 X2 Y2 X3 Y2

and on down the line using all combinations of X0-X7 Y0-Y7 ( 8 squared I believe ) 64

There is NO voltage or current involved with the complete of the circuit. It is just a reference to ground. Close the switch, get a complete circuit. The completed circuit sets up a 1 or 0 ( hi or low ) on the motherboard. Not referring to the logic inside the PLC.

So, do I use a relay setup and can I use 16, or do I need 64 ?

Can I only use outputs on module 1746-OBP16 ?

booleen math maybe?

Thanks for any direction you can give me.

Hi,

Thanks for finding my postings. Yes, I am a newbie to PLC logic, but not wiring and electronics. I can program in basic and read VB also.

The HMI interface I plan to use is the Proface 577R.

The PLC is the SLC 500 5/03

The inputs to my machine are nothing but completing continiuty in a circuit with a relay.

I have the Proface programmed with the buttons now. I have my RSLogix 500 talking to the SLC500, but they are getting along at all. I am getting a invalid node address and I can not go online with the SLC500.

No matter if I can go online with it anyway, I do not have the ladder logic figured out. So many examples of running conveyer belts, and fluid flows on the internet, but not any simple logic on talking to modules inside the PLC. I guess they figure you should already have studied this.

Best I can tell, I have the switches made in the Proface and will output as an address to the PLC. Each one is B3:0/0 and so on. I have them set as momentary. I was thinking maybe a OSR on the ladder logic. I cannot figure out how to address the output to the relay module in the SLC500 however. I have seen alot of examples, but I dont know what I am looking for in figuring out the relay opening and closing.

I am very sure the relay setup of 8 common and then 1 indivdual output will make up the X0-X7 as common, and then Y0-Y7 making up the indivdual outputs. With 4 OW16's I will have 64 total possible combinations. I need 60 of those 64.

Can you give me a ladder logic example and I can figure it out for the whole 60 inputs. One guy tried on PLCnet but then Bernie said it was wrong and he deleted it.

Hi, you might find this device very useful.  It may look intimidating at first but is actually quite simple to use.  "www.arduino.cc"