9/13/2007 10:51 AM | |
Joined: 9/13/2007 Last visit: 5/19/2024 Posts: 15 Rating: (0) |
Maybe, in the future , siemens will make a new profibus-DP modulefor S7-200 to connect with the400H system. |
9/20/2007 10:09 PM | |
Posts: 73 Rating: (20) |
Hello, Please see section 8.5 of the Automation System S7-400H Fault-tolerant Systems. This chapter may help you. |
9/25/2007 12:27 AM | |
Posts: 95 Rating: (10) |
This is possible with the Y-Link. Here are some additional links: /tf/WW/en/Posts/10739#46143 /tf/WW/en/Posts/11269#48639 Send a private message to me if you get stuck... |
9/25/2007 2:10 PM | |
Posts: 6 Rating: (0) |
Ok, thank you very much on your replies, I have finally solved problem, I downloaded new firmware version (V 4.0.6) to both IM-157 and everything is fine now. |
9/25/2007 5:08 PM | |
Posts: 95 Rating: (10) |
Hi Martina,
If everything on the bus is happy when the EM277 is not connected to the Y link and then everything fails when you connect the EM277 I am wondering if you have assigned the same Profibus address to two devices like one of the DP/DP and the EM277 have the same Profibus address. Another thought that comes to mind is the whole terminating resistor thing (the on/off switch on the Profibus connector). Only the end of the Profibus segmentgets terminated, if it is terminated in the middle you just lost everything downstream of that connection (Also note that the last Profibus node, which gets the ‘on’ position of the terminating resistor must be a powered device.) Oh, one more trivial detail… It is a good best practice to keep your shortest Profibus length to > 1 meter (because of possible reflections on a shorter length.) Other thoughts might be (something that happened to me – even as sharp as I am ) connecting the red/green wires on the Profibus connector backwards (this was before the color coded connectors came out but it took a day to troubleshoot no doubt! Good grounding is another ‘gotcha’ with Profibus… If none of this helps give me another try – I am happy to offer any assistance I can. I like puzzles and Profibus and these configurations create some mighty interesting puzzle’s to solve. Cheers, Darren In DallasAttachmentEM277_on_YLink.zip (250 Downloads) |
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