3/4/2021 8:34 AM | |
Joined: 4/24/2006 Last visit: 4/22/2024 Posts: 8611 Rating: (1147) |
Hello, The Bus parameters of Profibus DP can be different. See also this link: How do you set the PROFIBUS bus parameters when using OLMs in STEP 7? Best regards, Wizard |
3/4/2021 12:26 PM | |
Joined: 5/16/2018 Last visit: 1/17/2024 Posts: 30 Rating: (0) |
Thank you, so basically you need to add these because of the extra latency due to OLM`s and cable length ? If you don`t do it you can get problem with communication fault, watchdog activate? Nothing else? |
3/4/2021 1:48 PM | |
Joined: 5/16/2018 Last visit: 1/17/2024 Posts: 30 Rating: (0) |
What is the benefits how having more accurate profibus parameters? |
3/4/2021 2:53 PM | |
Joined: 9/27/2006 Last visit: 4/24/2024 Posts: 12257 Rating: (2665) |
Hello gordonere; If you happen to drive a car, do you ask yourself whether it is good to have it in tune, only because it will work more efficiently? When you program a PID control, do you try to calculate the best paramweter set, only because your controls will be more stable and efficient? Sorry if my questions are facetious, but you asked similar questions about Profibus bus tuning. Profibus timing parameters (Tbit [bit time], Tsdr [slave response time]...) are critical to a stable network at higher speeds or longer distances, and must be adjusted when there is implicit delays introduced by transmission equipment such as OLMs and repeaters; Profibus configuration software will recalculate these values to optimize the bus timing and transfer them to the DP master so it controls the bus at its best performance level depending of the bus description. If you want to have an understanding of these values and why they must be recalculated based on network properties, I can suggest you look at this very interesting presentation, Acromag's Profibus Technical Reference: https://www.acromag.com/wp-content/uploads/2019/06/Acromag_Intro_ProfibusDP_698A.pdf Daniel Chartier |
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