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knt2009

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  1. Dear all, I am new on this forum, even though I an using the Unitronics PLC for more than 10 years now. I have a problem with the RS485 MODBUS communication to the frequency converter. After I have established the communication to the converter I am not able to connect to the PLC with the programing computer. I have tried all possible settings of the comunication protocol bur without sucess. Can somebody give me some advice what to do? Is there a possiblity to do somehow a reset of the PLC? I am using M91 2 R2C Thanks and best regards,
  2. Hello, I am using a RS 485 MODBUS communication to controll the speed of the frequency converter (Commander SK from EMERSON). I did suceed to establish the communication between the PLC and the frquency converter, but afterwards I was not able to downlaod a new PLC program to the controller. Any communication between the programing PC and the PLC was no more possible. Can somebody give me some advise what to do? I was thinking about hardware reset or something like this. PLC type M91-2-R2C best regards, Miha
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