PC with S7 - 200 series PLC communication connection Siemens PLC

S7- 200 series PLC, there are three kinds of communication mode: one is a point-to-point ( PPI) Way for PLC programmer or other man-machine interface with the company product communication, the communication protocol is unknown to the public. Another way to DP, makes the PLC can through Profibus - this way DP communication interface connection Profibus field bus network, so as to enlarge the using range of PLC controller. The last way is free port communication ( 自由港) Way, defined by the user communication protocol, the realization of the PLC communication with peripherals. The following USES the free port communication mode, realize the PC and S7 - The 200 series PLC communication. PC with S7 - 200 series PLC, PC for RS232C communication interface, S7 - Series 200, free port for RS485. So the PC RS232 interface must go through RS232 / RS485 converter and then connected to the PLC communication port, the connection medium can be twisted pair or cable. Siemens provided by the PC/PPI cable with RS232 / RS485 converter, can directly use the PC/PPI cable, so under the condition of without increasing any hardware, you can easily connect the PLC controller and PC, as shown in figure 7 17. Also can realize multipoint connection. Figure 7 - With S7-17 PCS 200 series PLC of the connection
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have three basic components.