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| 10/10/2010 9:02 PM | |
Joined: 1/28/2009 Last visit: 9/10/2024 Posts: 6849 Rating:
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Dear forum's experts Please check the attachment,if I uncheck the safety program as shown in picture1,the CPU's safety reactions may halted ? Why an extera space on output process image of PLC set aside for a safety DI card? for this check picture2. hdhosseini AttachmentCPU_F.zip (196 Downloads) |
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| 10/11/2010 5:10 AM | |
Joined: 10/7/2005 Last visit: 9/13/2024 Posts: 3020 Rating:
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Hello hdhosseini
you will definetely be asking for trouble andI would strongly advise you against doing so. Why do you want to "uncheck" (disable) the safety program?
it has to with the fact that the safety related communication between the F-CPU and the F-I/O cards adds additonal checks into the message (e.g. Status/Control bytes, CRC's, message Sequence numbers)to achieve the required SIL3/CAT4 rating (you can find out more about this in the PROFIsafe Technology and Application - System Description). For this "extra safety related data" every F-DI (and/or F-AI) card needs also "outputs" and every F-DQ card needs also inputs. You will also notice that the amount of input bytes for a safety Input card is greaterthanwhat is required for the pure amount of inputs (e.g. a 24 channel F-Di has 3 Bytes ofinputs, butoccupies 10 bytes in the configuration). No need to worry about this too much though, you'll only use the "real" inputs and/or outputs which always are the first ones in the address range per card. I hope this helps |
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| 10/15/2010 6:11 PM | |
Joined: 8/31/2005 Last visit: 8/20/2024 Posts: 2198 Rating:
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Hello hdhosseini, have a look on this: https://www.automation.siemens.com/mdm/default.aspx?DocVersionId=9716918923&Language=en-US&TopicId=7801201419 |
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