I am programming a whole process that coordinates the movement of different motors, pneumatic cylinders, etc., and I have an emergency stop button to stop the process externally if necessary.
I am using CONTROLLINO MEGA. My question is: how should I program so that when I press the emergency button the code that controls all the movements stops completely? (and make everything remain stopped)
Thanks
In the real world, emergency stop is not allowed in software, must be hard wired.
Thank you!
What do you mean? I have an external physical button to wire to one of the CONTROLLINO pins . Of course I know that, but I want to know what should I program after wiring everything.
What bluejets means is that it is an uphill battle to get a regulatory agency to accept a software Emergency Stop. For obvious reasons: if your software crashes or is otherwise badly written (both the cases where you're most likely to need the E-Stop), how can you guarantee that the button will be acted on properly?
Standard behavior is to provide E-Stop by disabling power. Secondary problem is making sure that with power off, the system is actually safe. e.g., make sure that shutting off an actuator in mid-stroke doesn't cause a 10-ton weight to come down on someone's head.
A good article on the subject: Standards and options for e-stops | Control Design
Add a relay controlled by the E-stop. Take a contact closure off of that relay to one of the controller inputs to sense if the E-stop has been activated. As others have noted, the hardware E-stop circuit is the primary means of cutting electrical power to the machine, not the secondary means
https://electrical-engineering-portal.com/plc-power-supply-safety-circuits.
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