I have designed a simple SCADA system for a test in which there are only one PC takes responsibilities of supervising, storing data from process and one PLC takes responsibilities of taking data from sensors, calculating and sending them to the PC. But I have no actual PLCs, I’m using Siemens SIMATIC Step 7 software and PLC Sim for the test. Could you tell me how to connect the PC to the PLC which in fact is a PC with Siemens SIMATIC Step 7 software? Thanks!