Zelio PLC is a very interesting controller device from Schneider company and so easy to use and useful if you don't have a time or knowledge with micro controller but it is a little bit expensive comparing with Micro Controller.
there are many type of Zelio PLC depending on Number of input and output, the smallest one shown in below picture.
it contain from :
4 digital input (I1,I2,I3,I4).
4 analogue input from 0-10 volt (IB,IC,ID,IE) .
4 output (Q1,Q2.Q3,Q4).
available power power source (12 ,24 volt DC) and (100,240 volt AC) it depend on your requirement .
the cost of this type about 130 $ plus configuration cable 50 $ .
the software used for this PLC called (Zelio Soft 2) ,it support LDR (ladder language) and FBD (function block diagram) with full simulator.
Step 1: Switch On /Off
This Video showing how to use Zeliosoft to make a simple switch .
a Push button switch connected to I1 and two LEDs in Q1 & Q4 .