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Guest Jeff

Communications

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Hello, I usually work with a single SLC 500 and I have been asked to get two of them to work together. My questions are how do I set up the comms to read information from one plc to the other and also write to it using the standart DH+ protocal. How do I program the logic in Rslogic 500 to get a bit or block in one PLC to read/write to the other? Any Help would be grateful. Jeff

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Check in help under RS Logix and look up MSG. It's call the Message Instruction. You can message a read or write from SLC to SLC. Generally, you can setup a word that you set bits in at, and read those into another SLC word to make decisions. Here is maybe what you need: There are TWO programs to download at this link: http://domino.automation.rockwell.com/appl...AF?OpenDocument

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Thank you very much for you help and that link really helped alot.

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If the amount of data that you need to send from one PLC to the other is 1 word or less try the global status word. This has very little overhead and does not require the code that the MSG instructions do. It is a slick way of transfering small amounts of data.

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Borrowed yours until I could make my own. How did you make this one???

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I don't care if you use it... I took the animation from RSLogix and cut it into 10 slides, converted them to gif's and re-assembled as an animated gif.

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