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Hello everybody, I have a problem connecting CS1G-H CPU42 with CS1W-PRM21. Prm21 is inserted in slot 9, and i have previously made connection to prm21. After downloading configuration to prm21 i cant connect to prm21 anymore (connection to plc is working fine). The cx-configurator says CS1W-PRM21 PROFIBUS DP-V1 Master Communication Failure with UnitERH is on (red), BF is flashing red, RUN is on (green), PRM is on (green) and BST is flashing green. How can i restore comunication with the cs1w-prm21 to diagnose the problem? After some examination the problem is (probably) that i have configured prm21 to write in the adresses of CIO3000 to CIO3400. That is interfiering with other address. Is there any way to force the output of the prm21 off, or make device go in offline mode.At the power on of the prm21, i can test the connection via cx-configurator and is working and after 2 seconds the prm21 goes to stop mode and begin writing to address of the sysmac bus area. I am thinking if i can stop prm21 from writing to that area i will be able to connect and load default configuration.is that any way to stop the prm21 from automatic start? or is there a way to reset prm21 to factory settings? best regards

Good morning, I'm having an odd issue with CX Programmer and have hit a wall. I'm trying to upload a previous version of a program to an existing PLC (CS1G-H CPU42) and I keep getting the following error when I compile while online: "The read protection properties which are not supported by the connecting target PLC are set. Check the unit version of the PLC." This prevents the program from being uploaded. I have a first revision CS1, manufacture in 2005 from what I can tell. This exact program has been uploaded previously, but a modified version replaced it recently and I need to go back to the older version. Things I have tried so far. without success: - Removed UM Protection - Made sure Task protection is off for all tasks - Check DIP Switch #1, which is write protection, and made sure it is off - Used "Remove Password" and "Release access" functions from the PLC/Protection menu - Used the auto-verification to confirm the configured PLC is correct - Reuploaded a full backup of H & D memory, from the older program I am able to compile the program when offline, but it chokes when online. I am connecting to the PLC via a serial cable. I haven't found any help from the CX Programmer help, or the CS1 programming and operation manual. This error message is nowhere to be found. Anyone has a clue ? I'm at a loss right now. Thank you !