Pushbutton To Relay Control

Does anyone have experience using relays tied to EMC to replace pushbutton control?

I have the electrical connections all figured out and also type and size of relays needed at the connection points.

I am trying to figure out how to integrate this into EMC through a MESA 7I33. Also how you would architect the relay setup.

The stop circuit is Normally Closed (NC).

The FWD/REV are separate circuits with common, Normally Open (NO).

Certainly simple to get the FWD and REV signals from the Mesa 7i33 via relay. However, all they need is momentary (push) contact, not sure how to tell EMC to do that.

Then, how to seutp EMC to send a signal to another NC relay when it is ready to stop? Or, go with an enable singnal to a NO relay for the stop?

Thanks!

Nick

I believe you can program the output length of the oneshot, perhaps to make it long enough to latch the relay.

Rick G

Thanks everyone!

So, I get the theory here, but I am brand-new when it comes to setting up the hal programming - how would that look in HAL?

Does it matter what section of HAL to put the threads in?
Do I have to put the thread in to load the oneshot somewhere in HAL too?

Somthing like this?
loadrt oneshot
oneshot.2.width float in => Obit? (for 2 seconds)

How do you marry this up with the spindle start command in EMC? Do you just assign the start command to the same Obit and go from there (I have it assigned to an out on the 7I33 now via PnCConf).

Thanks, sorry I am new to setting up HAL and still trying to learn how it works in my spare time. I understand the assigning of EMC function in HAL to i/o bits, but not sure on the details.

Thanks!
Nick

OK, I will read it over and see if I can figure it out!