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Backhoff PLC BK 3100 & Siemens S7-15xx communication

Created by: ugophill at: 5/4/2023 12:21 PM (8 Replies)

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5/4/2023 12:21 PM	Rate (0)
ugophill Member Joined: 5/10/2022 Last visit: 1/31/2025 Posts: 3 Rating: (0)	Hello Dear Experts, I'm working on a revamping project. The line is currently using a Backhoff PLC (BK 3100), i'll have to add a new Siemens S7-15XX to control a part of the line. (Notice that the Siemens PLC is a new and powerfull model, the Backhoff's one is an old model) So i'll have 2 PLCs working togheter. I'll need to exchange data between the 2 PLCs, like setpoints, actualvalues, alarms, states. I saw that there are 2 solutions: Via software (cheaper) Via Hardware with a Profinet/Ethercat coupler (faster and robust) Dose someone have some suggestion on how to setup communication? What should i buy? The steps to implement this in TIA Portal? Some documentation? Also I read about Master/Slave communication, what does this means? With which criteria should i target PLC to be the Slave and which the Master? Ty everyone, have a nice day
	Last edited by: ugophill at: 05/04/2023 12:29:51
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5/4/2023 1:10 PM	Rate (1)
jacek d Platinum Member Joined: 9/23/2005 Last visit: 12/29/2025 Posts: 5149 Rating: (772)	The BK 3100 is not a PLC.
	Regards, Jacek What is confusing you is the fact that you never see a number but always its digit representation. So you end up thinking that the number is the representation. - Andrej Bauer Any claims against me - based on whatever legal reason - resulting from the use of any code and/or ideas presented on this forum shall be excluded. #StayWithUkraine
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5/4/2023 1:29 PM	Rate (1)
Madadi Bronze Member Joined: 12/28/2016 Last visit: 12/14/2025 Posts: 435 Rating: (55)	Hello ugophill BK3100 is not a CPU but a PROFIBUS Bus Coupler. This module is similar to Siemens ET200 and has the role of remote IO. You can connect this module to s71500 using Profibus network. You just need to pay attention to this, you must use a cpu with Profibus port or you must use Profibus module to communicate. You also need a GSD file to define in TIA software
	https://pnap.ir If this Information really helps, you could use the Rate function😉
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This contribution was helpful to 1 thankful Users ugophill

5/4/2023 2:03 PM	Rate (0)
ugophill Member Joined: 5/10/2022 Last visit: 1/31/2025 Posts: 3 Rating: (0)	Thank you for the fast reply. Yes you're right about BK3100, sorry for the mistake. It's a softPLC running on an old IPC Beckhoff C6140. So i can't use Profinet? Do you suggest any model of CPU / Profibus module? Thanks

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5/4/2023 2:13 PM	Rate (1)
Madadi Bronze Member Joined: 12/28/2016 Last visit: 12/14/2025 Posts: 435 Rating: (55)	Since the Beckhoff IPC C6140 does not have a built-in Profinet interface, using a Profibus module would be a good option to connect your Simatic S7-1500 to the IPC. Here are some CPU and Profibus module options to consider: CPU options: - S7-1516: This CPU has a higher processing speed and larger memory capacity compared to the S7-1500 CPU, making it ideal for complex applications. It supports Profinet, Profibus, and other interfaces. - S7-1515: This CPU is a good choice for standard applications and supports both Profinet and Profibus interfaces. It has a lower price point compared to the S7-1516. Profibus module options: - CM PtP RS485: This Serial module connects to the CPU's Profinet interface and provides RS485 connectivity for Serial connection. - CM 1542-5: This Profibus module plugs directly into the CPU and provides full Profibus DP functionality. It is a good choice for more complex Profibus applications. Make sure to verify with the manufacturer that the CPU and Profibus module you choose are compatible with your specific application and version of Simatic software.
	Last edited by: Madadi at: 05/05/2023 05:42:41 Last edited by: Madadi at: 05/05/2023 06:03:40 https://pnap.ir If this Information really helps, you could use the Rate function😉
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5/4/2023 2:43 PM	Rate (0)
ugophill Member Joined: 5/10/2022 Last visit: 1/31/2025 Posts: 3 Rating: (0)	Thank you Madadi, very helpfull answer, exactly what i needed. Have a nice day!

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5/5/2023 5:21 AM	Rate (0)
Duris_I Diamond Expert Joined: 4/28/2015 Last visit: 11/27/2025 Posts: 10970 Rating: (843)	Hello, Madadi - CM PtP RS485: This Profibus module connects to the CPU's Profinet interface and provides RS485 connectivity for Profibus DP. It is a cost-effective option for simple Profibus applications. - CP 342-5: This Profibus module plugs directly into the CPU and provides full Profibus DP functionality. It is a good choice for more complex Profibus applications. Make sure to verify with the manufacturer that the CPU and Profibus module you choose are compatible with your specific application and version of Simatic software. if I could recommend to do some revision of informations you've provided because some missunderstanding I see here probably, or little mistake what can put users to some confusion. CM PtP RS485 type isn't Profibus module but serial inerface for FreePort, Modbus RTU or USS protocols. In this case I recommend check right CM module order numbers for offer some correct infos. CP342-5 type is S7-300 module for Profibus DP and it's not clear to me reason to mention this module in case of use S7-1500 system. Can you pls in this case put some better light to this problematic or reason to show your informations as are now?
	With best regards... Ivan Duris Flight: OMICO
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This contribution was helpful to 1 thankful Users Madadi

5/5/2023 6:07 AM	Rate (0)
Madadi Bronze Member Joined: 12/28/2016 Last visit: 12/14/2025 Posts: 435 Rating: (55)	I meant CM 1542-5.
	https://pnap.ir If this Information really helps, you could use the Rate function😉
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5/5/2023 9:05 AM	Rate (0)
Duris_I Diamond Expert Joined: 4/28/2015 Last visit: 11/27/2025 Posts: 10970 Rating: (843)	Hello, pls again, you've recommended profibus solution with some module types in your post, description. In this case PtP module can't be used here as Profibus solution so I point you to this mistake also. It is clear simply from your post that this PtP RS485 module can be used as cheap Profibus solution what is wrong. I recommend also do changes about this wrong description, look at your all posts.
	With best regards... Ivan Duris Flight: OMICO
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This contribution was helpful to 1 thankful Users qwazee

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