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DP/DP Coupler Problems

Created by: maritov at: 5/22/2013 9:07 PM (2 Replies)

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5/22/2013 9:07 PM	Rate (0)
maritov Posts: 1 Rating: (0)	Dear: I'm using a DP-DP Coupler (158-0AD01-0XA0) to establish dialogue between two Profibus Master device, A and B where: - A is: SCHNEIDERQUANTUM 651 CPU + Board ProSoft Profibus Master PTQ PDP MV1. - B is: SCHNEIDER M340 CPU + PRM Profibus Master. Both A and B masters communicate well, but when the CPU A goes to STOP, the device B read values that to oscillate back and forth between the ZERO value and the previous value to STOP A. After this problem, I proceed to disconnect the Profibus cable between A andDP-DP Coupler, and B continues to read alternately. I would expect that B reads the last value or zero when A is going to STOP. In conclusion I need that if a fault arises in A (like a STOP CPU!), the device B must read the last value or zero values, but not alternating values! I hope you can help me in this situation. I´m using gsd version 1.04 15/12/2010 Thanks
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5/22/2013 10:01 PM	Rate (0)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 4/26/2025 Posts: 12346 Rating: (2710)	Hello maritov; This is the first time I hear of such behavior with a DP/DP Coupler.Normally I would have expected that invalid data would remain at the last known value. Here are some links that should help you diagnose the validity of the incoming data: Behavior of the DP/DP coupler when a master system fails Reduced user data capacity when using the diagnostics From the DP/DP Coupler manual (a link is available in the second FAQ): *Function principle of the data validity indication* The DP/DP Coupler enables the data transfer between two PROFIBUS DP networks. If one of the DP masters is silent, or data exchange is not possible due to an error at one of the DP/DP Coupler interfaces, the partner DP master should recognize invalid data transferred via the DP/DP Coupler. You can validate data either by means of the slave diagnostics functions, or directly by analyzing the I/O data. *Function of the “DIA” DIL switch (data validity indication)* The “DIA” DIL switch function allows you to validate I/O data. The setting of the “DIA” DIL switch does not influence the normal diagnostic messages of the DP/DP Coupler described in chapter 6.2. *“DIA” in “OFF” position* I/O data validation is disabled when the “DIA” switch is set to “OFF”. *“DIA” in “ON” position* I/O data validation is enabled when the “DIA” switch is set to “ON”. Hope this helps, Daniel Chartier

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7/8/2015 2:54 PM	Rate (0)
Min_Moderator Platinum Member Joined: 9/3/2014 Last visit: 3/13/2019 Posts: 4766 Rating: (122)	New question published by AutoGen_382671 is split to a separate thread with the subject Disconnect one side of DP-DP coupler -> no Error. Best regards Min_Moderator

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DP/DP Coupler Problems

Created by: maritov at: 5/22/2013 9:07 PM (2 Replies)

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maritov

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