text: <s>[INST] PowerFlex 525 periodically dropping run command I'm using a PowerFlex 525-EENET with embedded ethernet and revision 1.3. This is being used on a pump that is being constantly turned off and on by a level control. I have added traps in the program to capture every possible reason the pump could be losing run command but it captures nothing. In the program, when the problem is happening, the run command is active, but the output on the VFD is 0. Simply re-sending the run command corrects the problem. I was wondering if anyone else was having this same issue with 525s. [/INST] The PowerFlex 525 doesn't have a run command in the logic control word, it only has start and stop (PF525_Drive_Name:O.Start and PF525_Drive_Name:O.Stop). If the PLC sends a 'run' command then it must be doing additional logic to determine how the start and stop bits are controlled when the 'run' bit turns on and off. I would suggest setting up some logic to capture if the stop bit is ever put high when it shouldn't. For instance put an OTL instruction with a dummy tag in series with the drive stop command bit, if the dummy tag ever gets latched high then you know that a stop command was issued at some point and the problem probably lies somewhere in your program. Also, confirm that a stop is not being issued from any of the following sources: Network Stop tag Remote HIM Stop button Dedicated Stop input terminal 01/11 Configured Stop input via DigIn TermBlk SW Enable via DigIn TermBlk Safe Torque Off \\n </s>