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EPROM & PLC Memory Containing Different Programs

Created by: nevaland at: 6/16/2012 7:05 PM (5 Replies)

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6/16/2012 7:05 PM	Rate (0)
nevaland Experienced Member Joined: 12/23/2008 Last visit: 10/13/2024 Posts: 40 Rating: (0)	Hello All, I'm at a site with S5 115U 944 CPU containing EPROM (not EEPROM!) with old program, i dont have an UV Eraser, so now I intend to transfer the new program into the PLC memory directly. With the battery installed (hence retaining the PLC RAM contents in the event of power cycle), what can be the consequences if the old program is still stored on EPROM and new program is running in the PLC memory? I know, that in the case of total power loss, on restart the PLC memory will be overwritten with the old program still residing on EPROM. But can they run aside (two different programs) if every thing is normal? My question is that. Regards, Nevaland

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6/17/2012 10:46 AM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 1/15/2026 Posts: 3054 Rating: (1062)	nevaland But can they run aside (two different programs) if every thing is normal? Hello nevaland Yes you can have a different program in the RAM in a 944 CPU and it will be executed irrespective of what's in the EPROM. Have a look at the S5-115U Programmable Controller manual for more on this. 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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6/17/2012 10:19 PM	Rate (0)
nevaland Experienced Member Joined: 12/23/2008 Last visit: 10/13/2024 Posts: 40 Rating: (0)	Thanks fritz! I recently heard a local Siemens employee saying that when using the external USB programmer you don't need to erase the EPROM, when programming, it automatically erases the existing program on the EPROM and you don't need the UV eraser (which I highly doubt its possible that way), can you confirm?

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6/17/2012 11:41 PM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 1/15/2026 Posts: 3054 Rating: (1062)	Hello nevaland I'm afraid to say I can NOT confirm this and wonder if there was a misunderstanding. Perhaps the Siemens employeeunderstood that you have an EEPROM (Electrically Eraseable PROM) in which case a UV light does nothing and it can be erasedonly Electrically (e.g. via an external USB programmer ora Siemens PG). An EPROM however can only be erased via a UV light as far as I know (apartfrom taking the EPROM's chip window cover off,leaving it exposed to sunlight for a few days and keeping your fingers crossed). 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 nevaland

6/20/2012 7:52 PM	Rate (0)
nevaland Experienced Member Joined: 12/23/2008 Last visit: 10/13/2024 Posts: 40 Rating: (0)	Hey fritz! I'm also of that opinion that EPROM's can only be erased through UV and cannot be overwritten through blowing if a program is already residing on it (since I've worked on EPROM's before in the microcontroller era though not on S5) this was also verified by Siemens tech support when I asked them. Guess I have to hunt for a UV lamp in the middle of nowhere! :D Thanks a lot for your interest. Cheers!

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6/21/2012 12:06 AM	Rate (0)
BeVee Platinum Member Joined: 7/18/2011 Last visit: 4/11/2025 Posts: 521 Rating: (91)	nevaland Guess I have to hunt for a UV lamp in the middle of nowhere! :D Hi nevaland, Maybe you search for a tanning center, or ask if any of the employees(' wifes) has a private sunbed at home Kind regards, BV

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