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Messages - wombat

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Technical support / Re:DM wiping when reading from EEPROM
« on: December 17, 2010, 08:51:42 PM »
Software to access the PLC is .NET 4, using the Serial class. All seems good. When using only 16 words, there's still occassionally timeouts, but no problems. With 32 words it works to read although it may take retries when the conflict occurs, and causes the DM wiping. In quick simple tests the 32 word usually works with out a hitch, although occassionally it will cause the problem; it has to be done in succession so as it hits the timer to cause the problem to get a good repro.

Not sure on the lights as I am accessing remotely. Is there a programatic way I can tell if it has had a WDT reset ?

Thanks

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Technical support / DM wiping when reading from EEPROM
« on: December 17, 2010, 04:46:17 PM »
I'm interfacing with a T100M over serial coms, using multi-point protocol commands. When reading EEPROM integer data (RXI...), sometimes timeouts occur at the PLC and this appears to correspond with timer based operations on the PLC. the problem gets worse as it also causes the DM to be wiped.

I'm flying blind on this as I don't have the PLC's code; everything is based on external observations so any input would be most welcome.  I've observed that one timer appears to reset when this timeout occurs. What's even more interesting is I can only get it to do that when reading more than 16 words at a time. If it is Hex 20, (32 words), the timeouts when they occur will correspond with one of the timers restarting and the DM being wiped. If I only use Hex 10 words, timeouts are benign.

What could cause this conflict ?

Thanks

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