trabantexpress
Member
Hello everyone! I´m very green new with PLC and i searched for some help concerning my problem with Logo and did find this nice looking site.
Did download today a demo version of Siemens LogoSoft 6.1 programming tool. Did play around a little with the demo software and made a diagram for sequence on and off switching. Seems to me it works ok in the program (I don´t have any actual hardware to try it out)
It hit me what the Logo would do if supply voltage is lost, if the outputs would go all crazy if powered of and back on. What it would need to do in such a case is to stay in the last state as it was when Logo was up and running. this both at black out and when powering back on.
Could anyone explain me how this can be reached and if it´s possible to configure an output in such a way that it would change state if the unit would shut down? An alarm from a auxilary switch on protecting MCB would be one way. But if the fuse wouldn´t trip and the Plc would be at fault, there wouldn´t be any immediate alarm.
Hope that someone could help me out with this one
Did download today a demo version of Siemens LogoSoft 6.1 programming tool. Did play around a little with the demo software and made a diagram for sequence on and off switching. Seems to me it works ok in the program (I don´t have any actual hardware to try it out)
It hit me what the Logo would do if supply voltage is lost, if the outputs would go all crazy if powered of and back on. What it would need to do in such a case is to stay in the last state as it was when Logo was up and running. this both at black out and when powering back on.
Could anyone explain me how this can be reached and if it´s possible to configure an output in such a way that it would change state if the unit would shut down? An alarm from a auxilary switch on protecting MCB would be one way. But if the fuse wouldn´t trip and the Plc would be at fault, there wouldn´t be any immediate alarm.
Hope that someone could help me out with this one
Last edited: