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S7-1500 PLC Memory Concept

Created by: YogendraK at: 7/29/2014 2:22 PM (9 Replies)

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7/29/2014 2:22 PM	Rate (0)
YogendraK Silver Member Joined: 11/9/2008 Last visit: 12/7/2024 Posts: 410 Rating: (6)	Dear All, I Want use S7-1500 PLC . Before selection I want know the concept of Memory.For S7-1500 it is divide in to 2 part. Code memory & data Memory. Code memory for FB,FC & OB and Data Memory for Global,Instant data Block & technology object. Take following example if I have selected CPU 1511-1PN Work Memory for program --150KB & 1MB for data. Suppose my Programe memory is incresed above 150 kb (FB,FC& OB) Size and data memory below 1MB then what will happen ? Whether it will used data memory or external Load memory for required programe memory? Or I have to go for another CPU then What is use of Load Memory? Please help me to understand the concept of Memory. Regards, Yogendra G

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7/30/2014 11:46 AM	Rate (0)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 12/11/2024 Posts: 4365 Rating: (1457)	Hi, If you exceed the 150kb with FB, FC and OBs your program will not match in the CPU (it will not loaded). No way… Note: Work memory makes a similar rule as PC’s RAM and Load memory to PC’s HDD. You can have a lot of HDD but if your program doesn’t match on RAM, it will not work…
	Denilson Pegaia Siemens Industry Sector Technical Support
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7/30/2014 3:26 PM

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YogendraK

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Hi Pegaia,

Thanks for reply. As per your reply I need to keep my programe memory below 150Kb and data memory 1MB. If my program & data memory is increase 150kB & 1MB then I have to select another CPU ?? is it right.

One more query regarding S7-400 CPU. For e.g I haveSIMATIC S7-400, CPU 412-1 (6ES7 412-1XJ05-0AB0).See below details of Work memory. Suppose in S7-400 my program & data memory is increased below said data then I need to replace CPU with higher one is it right?

Work memory
integrated	288kbyte
integrated (for program)	144kbyte
integrated (for data)	144kbyte

Please help me to understand S7-1500 & S7-400 Memory concept. This is very important for selection of Proper CPU.

Regards,

Yogendra G

7/31/2014 1:00 PM	Rate (0)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 12/11/2024 Posts: 4365 Rating: (1457)	Hi, you are right: if you have more than 150k of program blocks, you will need change your CPU. Both CPU's (1500 and 400) has a similar memory concept, it is just the form that the product is showed to the marketing: your S7-400 has 144k for program and 144k for data (so, 144k+144k=288k) your S7-1500 has 150k for program and 1M for data (so, 1M+150k = 1,15M)
	Denilson Pegaia Siemens Industry Sector Technical Support
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This contribution was helpful to 1 thankful Users Md Gouse

8/4/2014 8:39 AM	Rate (0)
YogendraK Silver Member Joined: 11/9/2008 Last visit: 12/7/2024 Posts: 410 Rating: (6)	Hi Pegaia, Thanks for your help. Regards, Yogendra G

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8/4/2014 11:52 AM	Rate (0)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 12/11/2024 Posts: 4365 Rating: (1457)	You are wellcome :)
	Denilson Pegaia Siemens Industry Sector Technical Support
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6/10/2018 12:10 PM	Rate (0)
hsan Posts: 1 Rating: (0)	Denilson Pegaia HI Mr Pegaia, please how I can know the memory of my program & data to choose correctly my cpu .
hsan Posts: 1 Rating: (0)
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6/10/2018 1:46 PM	Rate (0)
Ste39 Platinum Member Joined: 1/21/2013 Last visit: 11/20/2024 Posts: 4620 Rating: (709)	hsan Denilson Pegaia HI Mr Pegaia, please how I can know the memory of my program & data to choose correctly my cpu . Hello, go to page 16: https://support.industry.siemens.com/cs/attachments/59193101/s71500_structure_and_use_of_the_PLC_memory_function_manual_en-US_en-US.pdf?download=true Attachment s71500_structure_and_use_of_the_PLC_memory_function_manual_en-US_en-US.pdf (803 Downloads)
	Last edited by: Jen_Moderator at: 6/20/2018 2:27:28 PM Added file as an attachment.
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6/10/2020 4:34 PM	Rate (0)
Sanket T. Regular Member Joined: 9/6/2014 Last visit: 11/27/2024 Posts: 9 Rating: (0)	Hi All, Is it okay if we use 100% work memory in s7 1500 PLC? Will it have any effect scan cycle time? Thanks & Regards, Sanket

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6/10/2020 5:18 PM	Rate (0)
0_Einstein Diamond Member Joined: 7/7/2010 Last visit: 12/11/2024 Posts: 15486 Rating: (2456)	If you use 100% work memory, you cannot offer any updates that require additional memory, so it's a bad idea to use all available work memory. If all your logic is solved every PLC scan, it will affect total scan time. If the project is configured to only solve logic required at that time, it can run efficiently even with a large program. For example, if there is a large initialize logic requirement, during normal operation, that logic should be ignored, so it has no effect on scan time. Sanket T. Hi All, Is it okay if we use 100% work memory in s7 1500 PLC? Will it have any effect scan cycle time? Thanks & Regards, Sanket
	science guy
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Created by: YogendraK at: 7/29/2014 2:22 PM (9 Replies)

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