After you are satisfied with your program simulation and have downloaded it to LOGO!, you can also perform an online test of the circuit program. An online test is similar to simulation in that you can view inputs and outputs and block parameters. It differs, however, in that you are testing the program running in the LOGO! device with "live" inputs rather than testing the program on the PC with simulated inputs.
The following example shows an online test of the practical example circuit program. In this example, input I1 was turned on and then turned off. The off-delay timer began counting when I1 was turned off:
See the topic Tools->Online Test for prequisite conditions for an online test.