Diagram of wireless communication methods of PLC Networks

PLC (Programmable Controller) is widely used in the industrial control field, and its ease of use is self-evident for slightly knowledgeable people. However, the data communication and setting of PLC are both implemented through RS485 wired mode. For general users, the PLC equipment is designed and integrated in the transformation or improvement project, in this case, it is very troublesome to re-deploy the communication lines. It is very painful for the system integrator to open or dig new cable trenches. Increasing the construction difficulty cannot guarantee the progress of the project, it is even more painful that cabling is impossible in some scenarios.

Two solutions are recommended here:

I, ExploitationDTDDedicated connection for wireless data terminals

In many cases, for example, if a large monitoring system has a large number of monitoring sites and the monitoring center uses wiring, the result is high investment costs and difficult construction, the system lacks flexibility and some environments cannot be wired. Therefore, wireless data transmission is the best choice for this problem. DTD wireless 485 data terminal can be used to replace wired RS485 and RS232 for wireless transmission of digital signals.

The wireless RS485 communication module is added to the PLC, and dtd433 wireless PLC communication terminal is used, which is equivalent to directly replacing the RS485 dual-line. It is easy to use without setting up. Communication distance covers 100 meters ~ 3000 meters. Topology Map of DTD wireless 485 data terminal replacing wired RS485:

 

Three typical implementation methods of siemens plc wireless communication are introduced here.

Solution1.MasterPLCMultiplePLCWireless Networking]

Multiple S7-200 siemens plc Modbus protocol wireless communication solution: more than three PLC wireless Modbus communication program between, PLC slave machine number can reach 250. This routine is for two and three or more Siemens S7-200 between the wireless Modbus protocol data transmission, constitute a point (host) on the multi-point (slave) wireless PLC measurement and control network,

One of the S7-200 as the host, from the machine according to different numbers can be increased to 250, this solution is used in a large number of projects, users can refer to the routine source code to write their own applications.

Solution2.Central Industrial Computer and long distancePLCWireless Communication]

Configuration Software and Siemens plc remote wireless communication solution: Kingview, force control, MCGS Kunlun communication mode, wincc and other mainstream configuration routines, in line with the wireless PPI, wireless Modbus protocol S7-200 communication configuration routine.

Solution3.Control center touch screen and long distancePLCWireless Communication]

Man-Machine Interface touch screen and Siemens plc Wireless Communication Scheme: W Lun touch screen, bu ke touch screen, autoface touch screen, MCGS touch screen and S7-200 siemens plc wireless communication configuration engineering example.

II, ExploitationDTP-S09FRemoteGPRSTerminal build public network connection

In the actual system, if the control room is not in the same area as the on-site user equipment, the on-site distance is very far from the general control center. if the distance between the two is greater than 5 kilometers, or the wiring is impossible, we can consider using the mobile GPRS public network for data transmission and remote monitoring. Using the mobile GPRS network, as long as the mobile phone signal can arrive, there is no distance limit, this solution is suitable for remote wireless communication.

[Wireless remote GPRS Communication Modbus solution between Siemens s7_200plc and Kingview]

In the industrial field may encounter such a situation, the PLC distributed in different places (workshops, control rooms, etc.) needs to remotely communicate with the Kingview software of the general control center, generally, cables are laid using a wired RS485 bus. This function is achieved through Modbus protocol.

The following describes how to implement Modbus Wireless Configuration communication using GPRS transparent data terminal and PLC. This solution can be used as an example of remote wireless communication between siemens plc and Kingview. This solution uses the intelligent data terminal dtp_s09f for wireless remote GPRS communication.

 

Diagram of wireless communication methods of PLC Networks