Neil Baylis wrote: > Yeah, I've seen some of these devices. You wouldn't think e-stop could > get so complicated. > > Get lawyers, and even WORSE, legislators involved in the process, and there's no limit to how bad it can get. If it has to absolutely stop the machine in a safe manner, even when a forklift spears the control cabinet, it CAN get complicated to design and test such a device. >> The problem with making it mechanical >> through the red button is that someone intentionally or accidentally >> jamming the button could prevent the E-stop action from happening. >> > > I wasn't thinking that the computer would use this as a way to stop > the machine. Rather, the computer would stop the machine however it > already does, but in addition it would press the e-stop, forcing the > operator to twist/lift the button before resuming, even if he never > pressed the button. > Right, but I really think this is unnecessary. The way a number of commercial controls do it is with an E-stop button and an E-stop reset button. The Estop button is lighted to tell you what the state of the control is. Of course, if you want to rig a mechanically indicating E-stop button, you could do this and have a completely unique device.
Jon ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
