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Double Profibus connection to S7-400H

Created by: Biagio at: 4/18/2012 7:27 AM (13 Replies)

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4/18/2012 7:27 AM	Rate (0)
Biagio Posts: 31 Rating: (1)	Good morning to all, I've a problem on a plant with redundant profibus communications. I installed a couple ot two repeaters and an active resistor to insert a S7400-H system on the profibus plant network. I defined for the CP443-5 of the PLC's the same network configurations. I connected the two cp443-5 at the 2 repeaters as shown in figure. With 2 digital outputs I switch the repeaters power to the active cpu. The terminal part of network is connected to an OLM. When I work with PLC 0 the network is good. When I switch to the second PLC the OLM CH2 blink red. I checked all the electrical connections but I didn't solve the problem. Is the configuration ok? Thanks Attachment Repeater_H.jpg (488 Downloads)
Biagio Posts: 31 Rating: (1)
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4/18/2012 7:43 AM	Rate (0)
TIBI68 Gold Member Joined: 12/1/2009 Last visit: 2/9/2025 Posts: 672 Rating: (147)	Hi Biagio , I have seen such hardware arrangement on some sites, but they were all not connected to an external profibus CP, they were connected to the internal profibus interface of the CPU. That's maybe yourproblem. Regards.
	Give us your feedback and show us your respect! We take our free time to support you with our knowledge and experience. If this post is helpfull to you kindly click on "Rate" or "Thank".
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4/18/2012 7:53 AM	Rate (0)
TIBI68 Gold Member Joined: 12/1/2009 Last visit: 2/9/2025 Posts: 672 Rating: (147)	I knew I saw that configuration somewhere. Take a look at this link. https://support.automation.siemens.com/WW/llisapi.dll?func=cslib.csinfo&objId=29715969&load=treecontent&lang=en&siteid=cseus&aktprim=0&objaction=csview&extranet=standard&viewreg=WW. Esspecially read what they write about the power supply of the two repeaters and the terminalresistors. What did you connected at the single profibus line? I would have triedto usea Y-LINK module first. But maybe not possible in your case. Regards.
	Give us your feedback and show us your respect! We take our free time to support you with our knowledge and experience. If this post is helpfull to you kindly click on "Rate" or "Thank".
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4/19/2012 5:34 PM	Rate (0)
Biagio Posts: 31 Rating: (1)	Thanks for the reply. I found the difference on the attched bitmap from the Siemens site suggested configuration and the realized configuration. It can be the problem? Thanks Attachment Repeater_Configuration.JPG (519 Downloads)
Biagio Posts: 31 Rating: (1)
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4/21/2012 2:40 AM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 3/14/2025 Posts: 3042 Rating: (1061)	Hello Biagio All I canoffer for now are a few questions: 1.) What devices are connected to the single OLM based Segment (Is it only a HMI or do you want to operateDP Slaves there)? TIBI68already asked this question too and it's answer will determine if your configuration will work or not.( I somewhat doubt that you have DP Slaves there, as this type of configuration wont be supported and you also won't be able to do a "correct" HWconfig for it, but please let us know anyhow). 2.) You say the OLM's CH2 LED (FO port) flashes red. Red flashing by itself does not (should not) exist,can you please check that again and see if it is a Red/Yellow flashing or permanently lit red (see also the OLM manual). 3.) If this an OLM V4, please confirm too that it is the CH2 LED and NOT the CH2-LEVEL LED.
	Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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4/21/2012 10:07 AM	Rate (0)
Biagio Posts: 31 Rating: (1)	Fritz, thanks for the reply. I'll try to explain better the situation. The OLM is connected to the plant profibus line. By this line an hmi with applicom card read with Protocol S7 information from my S7-400H PLC. When the first plc works and the first repeater is powered the connection is ok. When I switch on the second plc and the second repeater the connectiongo down. I think: can be the problem the sequence of installation of repeater-repeater-active resistance? We have installed the OLM profibus cable on the first Repeater (enter A2-B2), while on the Siemens site the external profibus connection is on the exit of the second repeater (A2'-B2') with sequence active resistance-repeater-repeater. The fault on the OLM is rapresented on the electric channel. Thanks
Biagio Posts: 31 Rating: (1)
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4/22/2012 8:16 AM	Rate (0)
TIBI68 Gold Member Joined: 12/1/2009 Last visit: 2/9/2025 Posts: 672 Rating: (147)	Hi Biagio , if I understand you correctlyyour OLM's are still connected to the external profibus cards. I think you shouldconnect them to the internal profibus port of the CPU's instead. Same configuration arrangement as in picture of the Siemens documentation. Regards.
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4/22/2012 9:29 AM	Rate (0)
Biagio Posts: 31 Rating: (1)	Thanks, But i think the problem is indipendend by cp card. Because with the first plc the network is good. I've the problem when the second plc become master. Thanks
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4/22/2012 9:49 AM	Rate (0)
TIBI68 Gold Member Joined: 12/1/2009 Last visit: 2/9/2025 Posts: 672 Rating: (147)	Biagio Thanks, But i think the problem is indipendend by cp card. Because with the first plc the network is good. I've the problem when the second plc become master. Thanks In case of a H-System one profibus (internal interface on CPU) is active and the other is standby. With external CP's both CP's areactive in parallel. Switching the Master does not switch the external profibus communication cards. But it will switch the internal profibus interface active/standby for sure! Regards.
	Last edited by: TIBI68 at: 4/22/2012 10:00 AM Give us your feedback and show us your respect! We take our free time to support you with our knowledge and experience. If this post is helpfull to you kindly click on "Rate" or "Thank".
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4/22/2012 9:59 AM	Rate (0)
Biagio Posts: 31 Rating: (1)	Stop of the master. Thanks
Biagio Posts: 31 Rating: (1)
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