Antonio D. Posted March 3, 2011 Report Share Posted March 3, 2011 Hi everyone! I'm having problems with serial connection (RS232) to a M91-2-T1 in debug mode. The PLC's serial connection was working fine in a test environment but after the assembly of the device in a production environment the serial connection became unreliable. It drops the connection after 10-20 seconds (variable) of running in debug mode and I cannot reconnect until the process has stopped. The ladder program consists of a welcome screen where you choose three tests. While the PLC is in the welcome screen, the connection is fine and I can debug without problems. When I select any test and start it, everything starts ok but after around 15 seconds a "Resyncing" message appears and the connection times out generating a "cannot connect" message. Every subsequent reconnection try is rejected and the port appears to be blocked by the PLC. All the hardware is the same (serial cables, computer, power supply), the only thing changed is the fact that the PLC is now mounted in a cabinet instead of a testing table. Any ideas/suggestions? Thanks in advance. AMD Quote Link to comment Share on other sites More sharing options...
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