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Comment IP or serial network? (Score 1) 178

People here are talking about ethernet and ip, but all the PLCs i've dealt with use 4 wire rs-485. Some do allow access to the serial network via ip, using a windows app. I don't know if the plant uses ethernet (using ip, or another protocol), but it's possible, if they have many devices over a large area. However, you shouldn't make that assumption.

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