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CFC F-system, communications wiht my SCADA

Created by: HenkAnalfabeet at: 8/15/2013 3:25 PM (2 Replies)

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8/15/2013 3:25 PM	Rate (0)
HenkAnalfabeet Posts: 46 Rating: (1)	S7 5.5 SP2 HF4 K5.5.2.4 CFC V7.0 SP1 7.0.1.0 ESD & F&G sytem using S7-412H with ET200M remote IO Interface via Simatic NET OPC Server to 3d party SCADA Ok, so I am working with CFC for a while now, I can get all the basics going but I am stuck however with a few issues that some knowledgeable people might be able to help me with. [schnippschnapp] 2) When setting up communications wiht my SCADA I am interfacing directly with the safety DB's via OPC. As a test I wrote a value to the safety system (assuming / hoping it would be rejected). The system went into F-stop. a tricky question here, but can I stop the system from doing this? at least for the Fire and Gas system. When an F-stop happens my plant is no longer protected / monitored for gas releases etc. which is a very bad situation to be in. The manual states I can create various F-shutdown groups, and only one group will be shutdown on detection of an error. Is it true that this will only work if the IO is segregated? right now my ESD and F&G IO are mixed over the cards for availability reasons. [schnippschnapp] other questions can be found in the following thread CFC F-system, standard MOS block CFC F-system, Chart IO CFC F-system, Code versions CFC F-system, CPU system status CFC F-system, sometimes when I place CFC blocks on the screen they are assigned different number these are the main things I am running into, any help would be greatly appreciated
HenkAnalfabeet Posts: 46 Rating: (1)	Last edited by: O_Moderator at: 8/20/2013 10:06 AM
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8/23/2013 7:01 AM	Rate (0)
yy1 Gold Member Joined: 3/24/2009 Last visit: 6/20/2023 Posts: 535 Rating: (111)	HenkAnalfabeet The manual states I can create various F-shutdown groups, and only one group will be shutdown on detection of an error. Is it true that this will only work if the IO is segregated? right now my ESD and F&G IO are mixed over the cards for availability reasons. Dear HenkAnalfabeet, yes, you can declare multiple shutdown-groups (use the F_PSG_M-block). But you have to be careful, because you have to use communication-blocks (F_R_xx / F_S_xx) to exchange data between 2 shoutdown-groups and one module can only be used in one shutdown-group. Best regards, yy1

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8/23/2013 8:29 AM	Rate (0)
HenkAnalfabeet Posts: 46 Rating: (1)	Thanks yy1, we both agree that using multiple shutdown groups will most likely not work or be pratical. To focus on the problem then; are you aware of a global setting in the system that disable write access to any safety related DB's unless I specifically authorise it? At the moment I can only do it in the OPC tab in my Network settings; but not only is this a longwinded process, mistakes can still happen. yesterday for instance I changed a functionblock in my program on my testbench. I compiled, it got assigned a new DB number, I updated the DB block name so the OPC server would pick it up (its a MOS block I am working on). I downloaded the program but forgot to update my OPC datafile... What happend next was a bit worrying; When I hit a MOS button on my SCADA system the safety program went into stop. Aftr some faultfinding I discovered that because the OPC .XDB file was not loaded the SCADA signal was sent to a datablock it was not supposed to go to (the "old" MOS block from before I compiled); the safety program picked this up as an illigal action and stopped processing safety (F&G) logic. This is a situation that can happen in real-life on a real plant and I must find a solution before I feel comfortable to start comissioning my safety system. I have a few ideas but the best sollution is just to only allow read access to all safety DB's via an outside link unless specifically authorised by the programmer. But this I cannot seem to do?
HenkAnalfabeet Posts: 46 Rating: (1)
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