1. How does Siemens S7-200PLC communicate with Wincc (1) PC/PPI cable + PC ACCESS, connected through OPC channel; (2) CP5611/CP5512 card + PC ACCESS, connected through OPC channel; (3) EM241+modem+PC ACCESS, connected through OPC channel; (4) EM277 is used as a slave station + SIMATIC NET, connected through OPC channel; (5) EM277 acts as a slave station + WINAC, connected via MPI channel; (6) Compile the free port protocol of C++PU22X (VB, C++, DELPHI, etc.), connect through OPC channel; (7) PC/MPI cable (USB interface) + PC ACCESS, connected via OPC channel; 2. The programming communication of Siemens s7-200 PLC through PC/PPI cable Programming communication via PC/PPI cable is the most common S7-200 programming method, and many people also encounter problems here. There are many factors that affect communication. To communicate smoothly, you must first pay attention to: Check the version compatibility of Micro/WIN and Windows operating system Those that have not been tested for compatibility with the Siemens version often have communication problems. Use Siemens original PC/PPI cable Including the RS232/PPI cable used to connect the RS232 serial port of the PC, and the USB/PPI cable connected to the USB port. 3. Modbus communication between s7-200/300/400 and third-party DCS Question: There is a project, there is one s7-200 (CPU is 224, only one communication interface and is occupied), one s7-200 (CPU is 226, two communication ports, PORT0 is free, PORT1 is occupied), and the other one The CPU of S7-300 is 315-2PN/DP (two Ethernet ports are not used), and there is a set of S7-400H system (CPU is 414-7H). Now I want to communicate with a third-party DCS on modbus. Do I need to add any hardware and communication lines? In addition, how to write a program to send data? 4. MODBUS wireless communication between two Siemens PLCs This situation may be encountered in the industrial field. PLCs distributed in different places (workshops, control room locations, etc.) need to be remotely controlled each other, usually using RS485 bus and completing this function through MODBUS protocol. If the on-site wiring is not convenient, wireless communication can also be used. Here is an example of Datai DTD433M wireless module and Siemens S7_200. 5. S7-200 and instrument communication There is a weighing indicator port that only supports RS232C (RXD, TXD, GND), and RS422 (+IN, -IN, +OUT, -OUT). Can I directly communicate with S7-200? Can I use free port communication and meter connection without an intermediate converter? Is it 485,232 at the bottom of the freeport? Answer: The internal circuit determines that the serial port of 200PLC only supports 485-based communication, not 232. 6. MODBUS communication between S7-200 and Schneider twido controller 7. Wincc communicates with S7-200PLC through PPI protocol 8. Method of MPI communication between PLC and WINCC configuration software 9. What protocol is used for the communication between the PPI port of S7-200 and the MPI port of S7-300? 10. How to set the DCE (local) and DTE (remote) modes of the PC/PPI cable 11. PPi realizes two plc communication routines 12. Communication between Siemens S7-200PLC and PC ACCESS 13. VB communicates with Siemens S7-200PLC PPI protocol 14. How does S7-300 realize PROFIBUS DP master-slave communication through GSD file 15. Siemens s7-200PLC and s7-300PLC usually use several connection methods 16. PLC and various touch screen connections, etc. Wire Pulling Winch,Wire Rope Pulling Winch,Wire Take up Machine,Gasoline Wire Rope Pulling Winch MARSHINE , https://www.puller-tensioner.com
