Issues with connecting the Siemens S7-300 to a computer
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The on-site device is an S7-300 PLC, and the connection module is a CP343-1 Lean; previously, it was connected via an Ethernet cable to a computer. Now, the computer needs to be placed in a room 140 meters away from the PLC. According to the standards, the maximum transmission distance for twisted pair is 100 meters. If twisted pair is not available, how can a computer be connected to a PLC? Can it be connected using coaxial cable? How to connect?
In this case, place the small switch shown in the screenshot 70 meters away from the PLC and 70 meters away from the computer; in other words, place it at a point that is 140 meters away from both of them.
Your method works well in an indoor environment; in the actual situation, the PLC is located in Building A while the computers are in Building B, and the wires have to run through outdoor cable trays. Switches cannot be placed outdoors!
Use an optical cable, and convert it to Ethernet with an optical terminal
Fiber optic + fiber optic transceiver – you can transmit over any distance you want
I guess twisted pair will work too; if it’s not that important, just make do with it
Put in an optical fiber; the latter DP bus should work too
Fiber optic cables plus fiber optic transceivers will do; several positions here use this method, and it’s very convenient