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Siemens S1200* can hang several streamlined touch screens
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For hardware version V3.0 and below, it can not be upgraded to V4.X.X. Its S7-1200 series of PLC sample manuals show that the number of connections supported by its integrated Ethernet ports is 23:
Three HMIs
Eight GET/PUT or S7 Communications for Client
1 for programming
Eight Ethernet instructions for user programs
Three for server GET/PUT or S7 communication
However, touch screen is usually the client and the initiator of communication. PLC belongs to the client, so the above nine connections can not be counted: 1 programmed connection, 8 client S7 communication connection. Touch screens can only use 14 connections (streamlined touch screens can be configured as Modbus TCP/IP clients and GET/PUT, or S7 communication master).
No CP network card to increase the number of connections to achieve communication with the streamlined screen. CP1242-7 TS module only adds access to the Internet, not touch screen.
Feasible solution, part of the touch screen uses DP interface model, and PLC is connected to PLC by expanding CM 1243-5DP master station module.
For V4.0 hardware version, standard practice (configuration under the same blog project)* Dalian connection number is only 12 + 6 dynamic total 18 (total number of connections does not exceed 62, can increase the number of dynamic connections accordingly). If need each HMI to read to PLC, write and diagnose will take up 3 connections, can only connect 6 HMIs. If you only do the display, you can connect 18 sets. If each one reads and writes, * more than 9 sets. If the touch screen is configured as a MODBUS TCP client (driven by Modicon Modbus TCP/IP) in different blog projects, eight additional connections (open user communication) can be added.
Supplement: The Ethernet connection of PLC is not based on the number of devices. It's calculated by connecting resources. Each screen can take up more than three resources. You configure 18 screens and 1 PLC in the same blog project to communicate successfully. Every screen can only occupy one resource. One of them is to read the PLC (only monitor), write the PLC (set parameters), or diagnose the PLC (alarm). I think your application should be different. The suggestion is to configure the other four in another blog project and use Modbus TCP/IP protocol to communicate. At the same time, write Modbus TCP server program in the original blog project.
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