talldude42
Member
Hello everyone. This is my first time designing a system from scratch. The system is for a rubber injection molding press. I have the PLC all put together, wired most of the programming done, and I am working on figuring out the emergency stop circuit now. My understanding is that when you hit the emergency stop button all functions of the machine will cease and cuts all power to everything except the controller and HMIs. I have 2 voltages, 24vDC which powers all inputs, and 110VAC which powers my outputs coming from the PLC.
My main question is, how are you able to have any sort of indicator telling the operator that the emergency stop has been pressed (such as stack light, alarm siren etc.) with out having some sort of output voltage going somewhere? Is it acceptable or common practice for this to be allowed? Our current machines were built with not much thought into these things and dont have any sort of indications that it has been pressed.
I currently have a pop up window on the hmi but thats it so far.
Thanks for your input and comments!
My main question is, how are you able to have any sort of indicator telling the operator that the emergency stop has been pressed (such as stack light, alarm siren etc.) with out having some sort of output voltage going somewhere? Is it acceptable or common practice for this to be allowed? Our current machines were built with not much thought into these things and dont have any sort of indications that it has been pressed.
I currently have a pop up window on the hmi but thats it so far.
Thanks for your input and comments!