3.1 S7-1200PLC Control Motor Star-Triangle Step-Down Start (Timer Instruction)+ 3.2 Application of S7-1200PLC Bit Logic Operation Instruction+ 3.3 S7-1200PLC Control Motor Star-Triangle Step-Down Start (Programming and Debugging)+ 3.4 S7-1200PLC Control Parking Lot Counting (Programming and Debugging)+ 3.5 S7-1200PLC Timing Count Control Programming Comprehensive Training+