Thanks for your answer, and im sorry if am not clear, but as you saw English is not my native language. Well i have typed the IP on the web browser and the diagnostic webpage open fine, the diagnostic doesn't show fails. As i said before if I ping the PLC this answer me, but when i open RS Linx the device doesn't appear on the device tree, even if i set a new driver. The person that ask us to help him with this PLC neither could connect, he tried with Ethernet and serial. When i try serial connection i can set the drive on the RSlinx using auto configuration, but when the setting is over and i open the device tree of that drive, i cant see any node. I did something different when i was setting a new serial drive. When the auto configuration ends i change the DEVICE from the Logix 5550/CompactLogix that appear after auto configuration to PLC-CH0, this beside the Comm Port list. And finish the drive. In this way i could see the device on the tree, even the properties. But when i tried to open comunication in RSLogix 5000 all the option, download, upload , go online are disabled. Any idea?
Now i know that the PLC firmware is 20.013
The RSlinx version is 3.71
and RS Logix 13.04 to 20.01
Thanks For your help