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Check PCS7 system resources for program expansion

Created by: mrich at: 6/17/2009 1:30 PM (7 Replies)

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8 Entries

6/17/2009 1:30 PM	Rate (1)
mrich Advanced Member Joined: 5/20/2009 Last visit: 3/14/2022 Posts: 32 Rating: (5)	Hi all, We have a PCS7 5.2 (single station [3 xOS])project running that should control an extranumber ofvalves (no SFC, no serious program, just remote operation and visualization and straight-forward interlocking). New remote IO will be added to existing Profibusses. Fact is that current CPU (older 417 model)is almost completely utilized, at leastconcerning memory (also OS tags are almost on licence count.) Upgrade PCS7 7.x is not within scope at the moment. If necessary we can buy a new CPU (and WinCC-tag licence upgrade). My question.... Can anyone tell me (or tell me where to find more info about) whatI have to check to make an estimation if the new program will fit and/or whatI have to look for in the specs of a new CPU. The following is whatI already had in mind myself: - OS: Check currentnumber of used 'External Tags' (WinCC project) - Check current 'Size in load memory' and 'size in work memory' (Properties block folder S7-progr.) - Check currentnumber of used communication channels (# messages from 'transfer.log' file) - Check current 'number of blocks' (OB,DB,FB..etc.) - check current cycle time performance of program. Then: -I configure one comlete valve (CFC chart with IO, valveblockand straightforward interlock logic, compile AS and OS, creata new OS pic with the valve on it - check above resources again, determine increased resource and mulitiply by number of valves (where applicable) - Then doa straightforward copy/paste for thenumber of valves, and compile again (AS/OS) - check above resources again.. I can evaluate findingsagainst spec-sheet new CPU-models... (I realize that cycle-time is a bit difficult to predict in this way...) Is this'quick and dirty' method giving me anyuseful information or do I miss important things with this approach... (If so... any suggestions for a better approach ??) Pleas do not advice to upgrade complete system to 7.x because of several(non-trechnical) reasons, this is not goïng to happensoon..... :-( kind regards, Marcel

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6/17/2009 2:31 PM	Rate (1)
daga Gold Member Joined: 3/18/2009 Last visit: 5/6/2024 Posts: 306 Rating: (94)	Firstly, let me say, your compilation is great. It should become a part of "How to expand your PCS7 system manual" , i.e if it exists Just a quick thought mrich - Check currentnumber of used communication channels (# messages from 'transfer.log' file) You would want to find out the communication jobs using the statistics data in CFC cross reference as described inthis FAQ. (Transfer.log will not give you the right values as it will not include statistics for AS-AS communication resources) mrich Is this'quick and dirty' method giving me anyuseful information or do I miss important things with this approach... Neither is this quick, nor dirty. I believe a very good method.

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6/17/2009 3:32 PM	Rate (0)
mrich Advanced Member Joined: 5/20/2009 Last visit: 3/14/2022 Posts: 32 Rating: (5)	Thanx daga, for your quick response and the tip about CFC-cross ref. OfcourseI immediately checked the crossref... But it is not clear to me how to determine the #comm.channels from this info (Even the FAQ didn't help me). I included a screenshot of the statistics crossref of my project. Can you help me with this? Regards, Marcel Attachment cross-ref.jpg (292 Downloads)

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6/17/2009 4:21 PM	Rate (1)
daga Gold Member Joined: 3/18/2009 Last visit: 5/6/2024 Posts: 306 Rating: (94)	990 in your case. See attached pic, I have "boxed" it. Attachment cross-ref.jpg (254 Downloads)

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6/17/2009 4:39 PM	Rate (0)
mrich Advanced Member Joined: 5/20/2009 Last visit: 3/14/2022 Posts: 32 Rating: (5)	Ofcourse !! Thanx again !!

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6/19/2009 1:08 PM	Rate (0)
mrich Advanced Member Joined: 5/20/2009 Last visit: 3/14/2022 Posts: 32 Rating: (5)	So now tha app. is using 990 communication channels. when I look into the CPU specifications of the current (about 5 yrs old) 417CPU, is read: S7 message functions: - Number of messages - Overall, max :1024 Do I compare the correct figures? If so...we're using 97% of it's capacity !! When I check for the newest model 417 CPU... The limit is still 1024 !! Is this meaning that I cant expand my app within this (single CPU) system ???? If so... what is the best solution? - The UR2 Rack is utilized 100% with comm modules, but an UR1 rack is possible so I could add a second CPU in this new rack. Have to create the app-expansion in the new CPU and set up some comminication between two CPU's... Anyone an idea where to find documention on this subject (multiCPU-projects) - Install a complete secondAS (basen onsimpler CPU) - Any other ideas ?

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This contribution was helpful to 1 thankful Users daga

6/19/2009 3:45 PM	Rate (1)
daga Gold Member Joined: 3/18/2009 Last visit: 5/6/2024 Posts: 306 Rating: (94)	Hello Marcel, The limit of 1024 is for "Symbol related messages" (See the specifications closely, I agree it is a little confusing). PCS7 (typically) uses "Block related messages". Now each block instance (which is communication related) will consume something referred to as communication job. This limit for new 417 CPUs is 10,000 (yes ten thousand!) You have to compare your 990 with this figure (so that's about 10% for new CPU) So if you were to count individual messages and were using a block with 8 messages, then the total number of messages you can achieve is 80,000 with the new 417 Am I making anything clear? I have attached a screen shot to show how you can check and change the allowed number of communcincation jobs. (of course with the limit of the CPU) regards. Attachment CommJobs.zip (294 Downloads)
	Last edited by: daga at: 6/19/2009 3:53 PM Last edited by: daga at: 6/19/2009 3:48 PM
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This contribution was helpful to 1 thankful Users mrich

6/22/2009 9:29 AM	Rate (0)
mrich Advanced Member Joined: 5/20/2009 Last visit: 3/14/2022 Posts: 32 Rating: (5)	Thanks! It is confusing indeed.... I already had the feelingI missed something and this shouldnot be a limitation becauseit should be so 'out of balance' with other resource limitations... But anyway... I was releived with your explanation so thanx again.. regards, Marcel

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