micro 810 set/reset function

[jgrant]

I'm pretty new to PLC's so this is a pretty simple question. I have a micro 810 and I'm trying to get the set and reset function to work. I have a NO contact going to the set coil and a NO contact going to the reset coil. Both set and reset coils have the same ID or name. When I debug the contacts turn green showing power to the coils but they won't latch on. I watched a youtube video and it seems like I'm doing everything right.

 

[adisharr]

Is the PLC in run mode?

Is the address you're setting / resetting used somewhere else?

The manual says the associated variable must be an output or user defined.

 

[jgrant]

Yes, it's in run mode. I can see the contacts change state, but the set or reset coils don't change. I am trying it in a simple program with two inputs (NO contacts) and 1 output SETS/Reset coils. They both (set and reset coils) both have the same address.

 

[dginbuffalo]

The NO contacts are not the same contacts are they? If so, you could be turning the coil on and off immediately.

Also- do you have a JSR instruction to get to the routine that has this programming in it?

 

[jgrant]

No, the contacts are different. I is input 0 and the other is input 1. I'm novice enough to not know what JSR is-- jump instruction maybe? I tried using it in a basic program controlling a couple conveyors and couldn't get it to work so I wrote a simple program with only 2 NO contacts and a set coil and a reset coil just to see if I could get it to work and it doesn't. I'm sure it's something pretty simple, but I can't figure it out.

 

[dginbuffalo]

Sorry- should have noticed that this was a Micro 810 and Connected Components project. I guess the simple questions would be- are you sure your inputs are coming on and that they are not on at the same time which would set and reset instantaneously?

 

[jgrant]

Yea, that is what baffles me. It's such a simple program. I can see the one contact change to green telling me it on and the other one stays off, but the set coil or reset coils won't turn on.

 

[dginbuffalo]

And you "built" the program and downloaded, its in "run" mode and no major faults?

 

[jgrant]

Yes it's in remote run mode. CCW prompts me to switch back to run after downloading and I can tell because the contacts change color signifying they are energizing. One thing that I'm wondering about is that in the youtube videos I have watched, they were able to click on a device to energize it. When I click on a component the Variable Monitoring box opens and I have to check the logical value box to energize my contacts.

 

[jgrant]

I'm trying to post a pic of my computer screen so maybe there is something noticeable. I don't know if it uploaded or not

 

[jgrant]

Of course you'll have to lay down to view it.

 

[danatomega]

Have you tried with an internal coil instead of a real world output coil? Not familiar with 810 but there should be some bit internal available for your testing.

 

[dginbuffalo]

You may want to try the input to an internal coil as danatomega stated and you could even try the set coil output with a direct line to energize it and see if the logic is actually running.

Also from your picture, is the input actually on or just highlighted? I can get my input to go highlight green offline just like your picture.

Being unfamiliar with CCW and the 810 I may be asking questions you already know. I've only used CCW to program safety relays and look at drives so far.

 

[jgrant]

No, the contact is not turned on in the picture, is only highlighted. It will turn red when on and that is working fine. Maybe I'm wrong, but I thought the set and reset functions were internal bits like a "B" bit in the SLC 500. That is what I'm trying to do, is turn the program on and off without using an external coil. Is there a better way to do this?

 

[dginbuffalo]

No, the contact is not turned on in the picture, is only highlighted. It will turn red when on and that is working fine. Maybe I'm wrong, but I thought the set and reset functions were internal bits like a "B" bit in the SLC 500. That is what I'm trying to do, is turn the program on and off without using an external coil. Is there a better way to do this?

OK- Just checking. The Set and Reset can be internal memory bits or they can be addressed to an actual output such as you show ( IO_E_DO_00).

Not exactly sure what you mean by turning the program on and off with an external coil?