high load memory

v.kerstholt

after few tests with the s7-1500 and s7-300 in combination with TIA portal.
i came to the conclusion that the load memory of s7-1500 blocks is way more then compare to the s7-300.
in some cases up to 10 times!
way are these blocks taken so much more load memory?

Pegaia

Hi,

TheS7-1500/S7-1200 store the comments of the program, S7-300 not. This makes a significant difference in the load memory usage.

This "read back" feature permits also that the stetical disposition of the instructions in the block could also be "uploaded". That means that the block is not more that a simple code, but the whole source archive should be stored in the CPU. This takes also more memory.

Take a look at a program comparation for LAD at /tf/WW/en/Posts/88783#top


Stays the "feature" that consecutives compilations of the same program generates differentes memory consuptions (little differences) (/tf/WW/en/Posts/89151#top). This makes also difficult to get a precise formula to calculate the memory consuption.

Hi,

A small comment: regarding Load memory Hi:

As the price per MB still is ridiculous hi SIEMENS needs to implement a function to
be able to select downloading comments or not. As we are many people working with the same blockswe areused to write a lot of comments to clarify functionality + our standard blocks revision history is also included as block comments. In old classic S7CPU's this was no problem, as the comments only was available offline.

Now when converting everything to S71500 my load memory increased drastically.
-Forcing me to by a big VERY expensiveMMC.

I thinkit is unacceptable, to bepunished economically for writing comments making programs more readable for others.

SIEMNS RTH: Decrease price on MMC or make it possible to not download comments.

//Mattias

New question published by Willybong is split to a separate thread with the subject S7-1500: Not enough memory to load.

Best regards
Jen_Moderator