1/22/2009 4:22 PM | |
Posts: 73 Rating:
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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 |
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