The siemens logo is neither function block nor ladder.
You basically start with an input on the left and build a program using things like AND gates, OR gates, Timers etc and link them to an output on the right hand side.
I think you can build blocks as well, it is a while since I last used one of those units.
If you are wanting simple on/off control then use digital inputs. Analogue is used for measuring for argument sake a voltage signal such as 0-10v. You may have more than one analogue input and sum them and use this to drive an output or control a timer.
When you say timers programmed do you mean to switch on at a certain time of day (like an immersion heater timer), or do you mean so you have a delay before an action?
I wouldn't recommend one of these types of unit for use as a time clock as it is pretty annoying to change the settings without a PC.
The delay before an action isn't a problem.
I think you can still get a LOGO starter kit which includes a PLC, software and the lead, along with a book on programming.
You basically start with an input on the left and build a program using things like AND gates, OR gates, Timers etc and link them to an output on the right hand side.
I think you can build blocks as well, it is a while since I last used one of those units.
If you are wanting simple on/off control then use digital inputs. Analogue is used for measuring for argument sake a voltage signal such as 0-10v. You may have more than one analogue input and sum them and use this to drive an output or control a timer.
When you say timers programmed do you mean to switch on at a certain time of day (like an immersion heater timer), or do you mean so you have a delay before an action?
I wouldn't recommend one of these types of unit for use as a time clock as it is pretty annoying to change the settings without a PC.
The delay before an action isn't a problem.
I think you can still get a LOGO starter kit which includes a PLC, software and the lead, along with a book on programming.
