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if i use a udt as inout variable. my datamemory for the 300 compiled in TIA portal is way higher

Created by: v.kerstholt at: 10/4/2013 3:08 PM (5 Replies)

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10/4/2013 3:08 PM	Rate (0)
v.kerstholt Posts: 58 Rating: (9)	FAQ-Expert Dear users of the Siemens Industry Online Support, Welcome to the forum thread on the FAQ „Why should whole structures instead of many single components be transferred for the S7-1500 when a block is called?“. Here you have the opportunity to scrutinize the solution presented in the FAQ, to amend it and to discuss other solutions. We are looking forward to your feedback and your comments. Enjoy! Your Industry Online Support Team. if i use a udt as inout variable. my datamemory for the 300 compiled in TIA portal is way higher. with the 1500 i don;t got this problem. what's the diffrent between the plc's that caused this problem?
v.kerstholt Posts: 58 Rating: (9)	Last edited by: O_Moderator at: 10/9/2013 9:29 AM new subject after splitting from /tf/WW/en/Posts/97394#top
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10/5/2013 2:05 PM	Rate (1)
fritz Diamond Member Joined: 10/7/2005 Last visit: 1/24/2025 Posts: 3032 Rating: (1059)	Hello v.kerstholt it seems that Siemens has changed the way complex Block parameters (e.g. Structures, UDT etc.) are accessed inside an FC/FB for the 1500 (I haven't tried so myself yet, soI take your word and that of the FAQ for it). Doing so in a 300 or 400 will certainly increase the memory requirements (and runtime) of the FC/FB consderably as you already observedand you can find the reasons for this in the thread Shall UDT make the difference in CPU Scan Time? I hope this helps
	Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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This contribution was helpful to 1 thankful Users hdhosseini

10/7/2013 8:37 AM	Rate (0)
v.kerstholt Posts: 58 Rating: (9)	Thanks for your helpfull reply, i noticed that Siemens has changed the way complex Block parameters for the 1500. but i'm wondered why thay did this in the 300 as well? or is the code compiled by TIA portal for the 300 based on the code compiled for the 1500? Or whatfor did siemens make this change in handling udt's?
v.kerstholt Posts: 58 Rating: (9)
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10/9/2013 2:51 PM	Rate (1)
Cicero Gold Member Joined: 10/10/2005 Last visit: 1/24/2025 Posts: 1932 Rating: (136)	Hello, using optimized data storage you can run your programs on the S7-1200/1500 at optimum performance. In this way you achieve a cycle time that is shorter on average by a factor of 3. See the FAQ in the internet in refer to the differents between standard and optimized block access: http://support.automation.siemens.com/WW/view/de/67655611 With best regards Cicero

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10/11/2013 9:55 AM	Rate (0)
v.kerstholt Posts: 58 Rating: (9)	Cicero Hello, using optimized data storage you can run your programs on the S7-1200/1500 at optimum performance. In this way you achieve a cycle time that is shorter on average by a factor of 3. See the FAQ in the internet in refer to the differents between standard and optimized block access: http://support.automation.siemens.com/WW/view/de/67655611 With best regards Cicero Cicero, i know that. it's the fact I'm investigatingif it is usefull to migrate with as7-300 to tia portal. With best regards, Vincent
v.kerstholt Posts: 58 Rating: (9)
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10/30/2013 3:38 PM	Rate (0)
Cicero Gold Member Joined: 10/10/2005 Last visit: 1/24/2025 Posts: 1932 Rating: (136)	Hello, see the different of UDT/S7-PLC data tpye between STEP 7 V5.5 and STEP 7 (TIA Poral) V12 in the FAQ: http://support.automation.siemens.com/WW/view/de/67582844 With best regards Cicero

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