1/7/2018 3:38 PM | |
Joined: 9/27/2006 Last visit: 9/19/2024 Posts: 12282 Rating: (2684) |
Hello sherief; The CP 341 dongle is a hardwäre key that should be inserted in the back of the CP module if you want to enable Modbus RTU protocol functions on this CP, with the Siemens Modbus software. The alternative Modbus drivers developed by forum members as individual projects, such as the one provided by TIBI68,do not require a dongle and work with a CP 341. Modbus RTU master, no dongle required Hope this helps, Daniel Chartier |
Last edited by: dchartier at: 1/7/2018 3:40:42 PMLast edited by: dchartier at: 1/7/2018 5:06:14 PM |
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This contribution was helpful to3 thankful Users |
1/7/2018 4:48 PM | |
Joined: 9/27/2006 Last visit: 9/19/2024 Posts: 12282 Rating: (2684) |
Hello sherief; Modbus is not a regulated protocol, there is no enforcement of the Modbus functions supported by the manufacturers. So it is conceivable that your Modbus slave could support less often used functions that the master cannot. You have to evaluate if you can live with the supported functions. If you have no experience with Modbus, I suggest you start with this enlightening document, provided by our friend smiffy. Then at least we can discuss things with the same vocabulary: If you require a more detailed document, this guideline is provided by Modicon (the developers of Modbus): http://modbus.org/docs/PI_MBUS_300.pdf Hope this helps, Daniel Chartier Edit: Whenever you use a project developped by someone outside the Siemens organization, Siemens offers no support for the functions proposed. In this case (TIBI68's project for Modbus without CP dongle, you should contact TIBI68 though the forum (reply to his thread) if some examples or explanations are required. D.C, |
Last edited by: dchartier at: 1/7/2018 4:49:39 PMLast edited by: dchartier at: 1/7/2018 5:11:06 PM |
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This contribution was helpful to1 thankful Users |
1/7/2018 6:43 PM | |
Joined: 1/21/2013 Last visit: 9/4/2024 Posts: 4620 Rating: (707) |
Hello sherief, like this? but you need dongle (I think or 1SI) Modbus Sample Project Simatic Manager - Entries - Forum - Industry ... |
Last edited by: Ste39 at: 1/7/2018 6:44:41 PM |
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1/8/2018 10:09 AM | |
Joined: 10/14/2009 Last visit: 10/17/2022 Posts: 140 Rating: (1) |
Thanks for advice In my case which one I will order 6ES7870-1AA01-0YA0 OR 6ES7870-1AB01-0YA0 |
1/8/2018 11:10 AM | |
Joined: 10/14/2009 Last visit: 10/17/2022 Posts: 140 Rating: (1) |
I will use my CP 341 as master and 2 slaves of rectivar |
1/8/2018 11:26 AM | ||
Joined: 10/14/2009 Last visit: 10/17/2022 Posts: 140 Rating: (1) |
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