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SM326 loss of communcation???

Created by: sample0527 at: 1/20/2009 1:54 PM (4 Replies)

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1/20/2009 1:54 PM	Rate (0)
sample0527 Experienced Member Joined: 5/8/2008 Last visit: 9/3/2024 Posts: 50 Rating: (1)	I have a problem about SM326 6ES7 326-2BF01-0AB0. I just Config CPU315F and SM326.I edit depend on my attachment file.When I download hardware config to PLC.The SM326 SFdoes light .I online to monitor module(SM326) and display loss of communcation.So I change some parameter about S7-CPU Startup.The problem still appear.Can anybody tell me how to solve the problem? Attachment 0.JPG (249 Downloads)

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1/20/2009 3:37 PM	Rate (0)
Denilson Pegaia Platinum Member Joined: 9/23/2005 Last visit: 9/19/2024 Posts: 4347 Rating: (1446)	Hi, a fail safety communication involves little dectails in the HW config and in the user program. My suggestion is to test you HW first as "standard" way. Set all dips of SM to zero, and don't check "CPU has a fail safe program" check box. Work like a standard module and tell us the result of your test.
	Denilson Pegaia Siemens Industry Sector Technical Support
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1/21/2009 4:33 AM	Rate (0)
sample0527 Experienced Member Joined: 5/8/2008 Last visit: 9/3/2024 Posts: 50 Rating: (1)	In the standard mode I think it's ok.....The SM326 SF doesn't light...The attachment file is online of sm326 status.. but I have a question...After I download hardware config...Do I need download any porgram aboutDB or FB of safty program to the cpu?If I need,How do I create the DB or FB of safty program?I already set up S7_Distributed_Safety_Programming V54 SP1....but I open the icon,I cna't create any FB and DB.....thx Attachment 0.JPG (231 Downloads)

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1/21/2009 5:15 PM	Rate (1)
Denilson Pegaia Platinum Member Joined: 9/23/2005 Last visit: 9/19/2024 Posts: 4347 Rating: (1446)	Hi,if you SM runs ok in standard mode, and give this specific diagnose in safety mode, I conclude that the most probable cause is that you don't exchange data (i.e. read inputs or write outputs of the module) cyclically in you user safety program.If you don't read/write IO data to a safety module cyclically, it goes in passivation state, by communication fault.I suggest you take a look at the "s7-distributed safety- configuring and programming" manual about fail safe programming.
	Denilson Pegaia Siemens Industry Sector Technical Support
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1/22/2009 4:22 PM	Rate (0)
Safety1 Posts: 73 Rating: (20)	Hello Sample0527, All profisafe modules whether they are on a Profibus Ntework, Profinet network or even on the backplane mounted beside the FPLC use Profisafe. Profisafe is a one of the Profiles in the PNO. Profisafe communications are found in two places 1)in each Profisafe I/O module2) in theFPLC program. 1) Make sure that your setting for your FI/O module are correct for the type of wiring [1oo1, 1oo2 etc]. If you are connecting Light Curtains directly to the FDI you may need to switch off the monitoring for that channel. The Profisafe time is another parameter which must be determined for the module to communicate properly. When I say properly I mean not too short but not too long. Too short and you will end up with Profisafe communication errors and too long means that the Safety Response time may be slower [depending on the fault]. Please note that the OB35 time is part of the Profisafe time. You can use the S7FCOTIB.xls to determine the minimum Profisafe time. 2) In order for the Profisafe communication to take place in the FCPU you mustinsert an F-FB or F-FC using F-LAD or F-FBD. In your F-FB/F-FCladder logic you mustaddress at least oneF input and one F output froman FDI and FDO module. You can use the F_GLOBDB.VKE0 [always off bit]in your program to stop the outputs from turning on while testing.Save and compile the ladder. Close the ladder editor. Insert another F-FC with language FCALL. Assign your Fladder block to this FCALL. Save and compile the safety program. Download the entire program from the Edit Safety Program window.Insert OB35in the blocks folder and make a call to theFCALL F-FC Block. Save and compile and download. Compile - Once the compiler sees that you have used some of the F-I/O it will create the Profisafe communication blocks for the modules addressed. If everything is ok the SF light should turn off and the SAFE light turn on.Please read the manuals and the S7 Distributed Safety getting started PDF. You will find them at http://support.automation.siemens.com/WW/view/en/11669702/133300 Various S7FCOTIB.xls are available. Use the one for the version of S7 Dist Safety that you have. http://support.automation.siemens.com/WW/view/en/11669702/133100
Safety1 Posts: 73 Rating: (20)
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