This video explain the working of SR & RS Block which are used to latch/hold the contact. This function is widely used in Interlocking, Latching, Unlatching of the coil in control circuit.
Connect I/O is a free SoftPLC which is able to communicate with different types of technologies. It enables the creation and control of data flows between input and output points. The application can be connected to both software and hardware and will work as a bridge between them.
Engine I/O allows the exchange of data with external applications. This is how Connect I/O interfaces with other Real Games software.