Hello
I know it would depend of the applicaton but to the older peoples here (That was in the programming when plc was slower than now) what is your usual safe scantime limit to respect and why ?
I personnaly try to keep it average under 100ms and use the right plc size for the application but sometimes we are asked to do bad things or explaining why we refuse to do it....
I have to control protections on a constant running machine and i have a special application that would rise it near to 4-500ms and i'm a bit afraid to do so...
i never experienced a very slow scan time to know well what it cause and how it would react... at which level it will begin to give issues etc...
I know it would depend of the applicaton but to the older peoples here (That was in the programming when plc was slower than now) what is your usual safe scantime limit to respect and why ?
I personnaly try to keep it average under 100ms and use the right plc size for the application but sometimes we are asked to do bad things or explaining why we refuse to do it....
I have to control protections on a constant running machine and i have a special application that would rise it near to 4-500ms and i'm a bit afraid to do so...
i never experienced a very slow scan time to know well what it cause and how it would react... at which level it will begin to give issues etc...