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 Post subject: Telemecanique Modicon TSX Nano 07 PLC
PostPosted: Thu Feb 08, 2018 2:13 pm 
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Joined: Thu Oct 26, 2006 7:11 pm
Posts: 1302
Location: Maryland
Anyone out there familiar with the Telemecanique Modicon TSX Nano 07 series of logic controllers?
This PLC is installed in a bindery machine and a few weeks ago it failed, error LED on, no activity.
Their factory tech support gave a diagnosis that it was 'un-powered for too long'...? and the program needs to be reloaded.
So, 48 wires later I had it out and the customer shipped it to the tech support to 'reload' the program.
I installed it when it was returned and all ran as expected....Until yesterday when it dumped again. Same error LED on.
Now the customer is trying to get a replacement from the service group that supports this machine.
My impression is that this PLC uses NVR for the program storage and then loads a copy on startup. So is it a a bad NVR, Internal memory, boot sequence???.
Not at all that 'un-powered bunk. Since they will probably do some sort of exchange on the replacement, does anyone want to venture a virtual necroscopy on this dead dog?

Just moving on....



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“To invent, you need a good imagination and a big pile of junk.” (T. Edison)
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 Post subject: Re: Telemecanique Modicon TSX Nano 07 PLC
PostPosted: Mon Feb 12, 2018 4:16 pm 
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Joined: Thu Aug 01, 2002 12:01 am
Posts: 2809
Location: San Jose CA
an NVR has an internal backup battery but I am unsure if it can be measured external to the package (pin 16 and 20 on some). Its old technology with flash memory and EPROMS mostly replacing it.

Is there a coin battery on the module, you would think they would have replaced it when they reloaded though if there is one. Too bad the user cannot load the firmware.


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 Post subject: Re: Telemecanique Modicon TSX Nano 07 PLC
PostPosted: Mon Feb 12, 2018 4:51 pm 
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Joined: Thu Oct 26, 2006 7:11 pm
Posts: 1302
Location: Maryland
The vendor is supposed to be getting a 'refurb' unit together for the customer for $$$$, but I have seen several on ebay for +/- $200
So then, if that's the case would you expect that any of these PLC's of the same vintage will have the same issue?
Is his ship sinking?



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Len

“To invent, you need a good imagination and a big pile of junk.” (T. Edison)
"I must be on the way to success since I already have the junk". (Me)
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 Post subject: Re: Telemecanique Modicon TSX Nano 07 PLC
PostPosted: Mon Feb 12, 2018 5:49 pm 
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Joined: Thu Aug 01, 2002 12:01 am
Posts: 2809
Location: San Jose CA
without knowing the details of construction it is hard to say. you said NVR and I thought of a battery backed RAM but it might not be. A photo of the guts would help in that assessment or a list of IC part numbers. What is the vintage? Battery backed RAM would be up to mid 90s I would guess. maybe some old Flash had data retention issues too. Even a modern Flash card is not intended to be archival in reliability but should last years. EPROM embedded or beside a uController would be more common now, probably in serial format. EPROMS have very long data retention times too.


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