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Logo memory durability?

Created by: Bonk at: 5/12/2010 5:22 PM (3 Replies)

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5/12/2010 5:22 PM	Rate (0)
Bonk Posts: 5 Rating: (0)	Is there any limitations for the number of instances to add data Logo memory? I'm planning a PC-based system to manipulate Logo program parameters. If I change Logo program constantly on daily basis, when/or will the system fail?
Bonk Posts: 5 Rating: (0)
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5/21/2010 1:23 PM	Rate (2)
Helmut_13 Posts: 2930 Rating: (432)	Hi, I'm not sure what you mean with change program daily. Worst case is to download a new program each day. In this case I expect LOGO! has the same limitations then all the other controllers. The program is based in an internal EEPROM. The max. write cycles of a EEPROM is 100.000 times. So if I'm right, then or LOGO! may be destroid after 100.000 days,or in~ 274 years. So I belive you will not be alive if the LOGO! gets damaged Hope this hepls
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This contribution was helpful to 1 thankful Users LOGO!Barbarian

5/26/2010 11:10 PM	Rate (0)
Bonk Posts: 5 Rating: (0)	Thanks Helmut_13, you answered the right question. However, the scenario I had in mind was the following. I need to set daily timers to turn electronic devices on and off. If I change the timer setting, or select correct timer in Logo software or with the Logo panel, is this what you considered as downloading program to EEPROM? I've studied Logo software, and I believe I can make a PC based management console for connecting to Logo and setting timer parameters. These parameters will be changed roughly once a day. What would be the correct way of doing this with Logo without any personal hacking? Thanks in advance!
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5/27/2010 1:36 PM	Rate (1)
LOGO!Barbarian Posts: 173 Rating: (95)	Hi Bonk! What Helmut_13 means is that the internal EEPROM of the LOGO! where the program is stored can be written to 100 000 times (i.e. downloads). If you have a running program and you are just changing the timer parameters on the LOGO! via the cursor buttons or non-password secured TD (Set Parm mode) or via a message text by pressing and holding the OK button until a cursor appears and can be navigated to the respective displayed parameter and hen edited - ending with pressing ESC, then this does not change the memory durability because you are not downloading the program into EEPROM again. The version on the LOGO! will just be different to the version on your PC. If you use your PC to change the parameters inside each block each day and get them into the LOGO! via a download, then you are going into the 100 000 write cycle area, but I do not think that you will live long enough to make the last timer change in the 274th year! A more elegant way would be to use the TD, together with a menu structure example on the application example page of the site www.siemens.com/logo. You could build a simple menu with up to 50 pages where you could set one timer per page (i.e. 50 timers) independant of each other. You could do this with the application example of setting an up/down counter using F2 & F3 (F1 & F4 used for scrolling through the message texts) and then referencing this value into the necessary timers. Both of these examples have been very well described on this page. You could also set the retentivity of the up/down counters and the timers that they are referencing to so that the times you have set are not lost with a power failure. You might wear out the F1..F4 buttons on the TD though, so I suggest getting some custom printed self-adhesive overlays which will protect the buttons, prolong their operational life and also give you the opportunity to customise the TD display with your own look & feel (see attached) Hope this helps! Aaaaarrrgghhhhh! ("Have a nice day!") Attachment LOGO_TD_Custom_Faceplates.zip (334 Downloads)
LOGO!Barbarian Posts: 173 Rating: (95)
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