tecnico Posted April 8, 2015 Share Posted April 8, 2015 In order to verify if a certain modification to a PLC has been actually done I normally upload the PLC from the machine. Hovever, especially if the connection is slow (but it happened also locally), at times the Pewin32Pro2 opens this in the Editor Window CLOSE END GATHER DELETE GATHER DELETE TRACE OPEN PLC 13 CLEAR IF(I5612!>0) CLOSE The actual PLC size is more than 800, so I don't understand why this happens. I also tried with a fresh workspace (sometimes it is impossible to make backups with a certain workspace) with no luck. What can be the cause of such a behaviour? Link to comment Share on other sites More sharing options...
steve.milici Posted April 27, 2015 Share Posted April 27, 2015 This would be indicative of a communication failure of some type - what port do you use? Link to comment Share on other sites More sharing options...
tecnico Posted April 30, 2015 Author Share Posted April 30, 2015 Ethernet Link to comment Share on other sites More sharing options...
steve.milici Posted April 30, 2015 Share Posted April 30, 2015 Does USB communication work OK? If this is true it may be due to your maximum packet settings in the windows registry. Check the registry at the following location: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\{long number in curly braces} {long number in curly braces} - is a different number for each Ethernet adapter. Some VPN software products will change all the Ethernet adapters. There is a key called MTU (maximum transfer unit). VPN software goes in and reduces the MTU to some smaller value that is good for 56K modems. This prevents large packets from being transferred across the Ethernet port. Delete the MTU key and Windows will use its normal default. You will have to reboot Windows to have the setting take effect. In addition you will have to restart the PMAC if you have communicated with the PMAC without having the MTU reset. Note that this may affect the VPN software - it may not be possible to use VPN and our Executive over Ethernet simultaneously. In this case USB communication to the PMAC will be OK. Link to comment Share on other sites More sharing options...
tecnico Posted May 5, 2015 Author Share Posted May 5, 2015 I didn't try with USB - will make a test next time this happens. The strange thing is that power cycling the PMAC this behaviour disappears. Link to comment Share on other sites More sharing options...
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