3/16/2024 1:38 PM | |
Joined: 3/30/2020 Last visit: 8/19/2024 Posts: 4698 Rating: (975) |
You do not mention which HMI you are aiming to use. I am guessing you will need the master connection on the PLC (option 3). There is an alternative which will have you use the Ethernet link: MAXIMUM LENGTH FOR REMOTE I/O ON PROFINET ..
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3/17/2024 4:39 AM | |
Joined: 3/14/2024 Last visit: 3/17/2024 Posts: 4 Rating: (0) |
Thank you for your answer. I want to use HMI model (SIMATIC HMI KTP700 Basic color DP) with code (6AV2123-2GA03-0AX0). Can you explain why I should use number 3 or the same type of Master card? Because it costs a lot more. |
Last edited by: Jen_Moderator at: 03/18/2024 12:11:27Text formatting optimized. |
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3/17/2024 7:22 AM | |
Joined: 3/30/2020 Last visit: 8/19/2024 Posts: 4698 Rating: (975) |
Profibus communication needs a master on the bus. The KTP700 DP is not a master. That means the PLC needs to be the master. That means the more expensive CM1243-5. That would allow a link of up to 400m but at a lower communication speed. It is also assumed that the certified Profibus cable is used. [LINK: S7-1200 and Simatic HMI] There seems to be a problem that it is not possible to simulate the PLC-HMI when using a Profibus connection. I have tested in TIA Portal V17, though it is possible that some setting is missing. [LINK: Connecting HMI (KTP700) to s7-1200 through profibus module CM1243-5] --- It is not 100% the truth that the CM1243-5 is the only way to make a connection with the KTP700 DP. It is possible to use the CM1241 to link with Modbus RTU. In WinCC you assign the PLC as "Modicon Modbus RTU". [LINK:Connecting HMI (KTP700) to s7-1200 through profibus module CM1243-5] Even though this is possible, this method is not recommended. The effort (time spent) to make this solution work may not worth it for just one project.
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I would not have used Siemens switches. Less expensive switches used by the PC market would work for PLC-HMI communications. I would have used at least 2 network switch. We tend to have a network switch close to the PLC .. that would then be the 3rd network switch. Carrying power over that distance is far less of a problem than the small voltages used by communications. Distortion of communications is the bigger enemy than the physical power transfer. CAT4 cabling will not do the job. The cable needs to have proper shielding. Investing in a network cable testing device is a good idea. The kind IT network installers use, which is not very expensive. We have had a shipment of bad network plugs which would have caused all sorts of issues if we did not have a means to check connections of our self made cabling. |
Activities of this user is voluntary. There is no obligation or liability placed on this user. Though optional, your 'please' and 'thank you' is highly valued. |
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3/17/2024 11:27 AM | |
Joined: 3/14/2024 Last visit: 3/17/2024 Posts: 4 Rating: (0) |
thank you very much |
This contribution was helpful to1 thankful Users |
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