text: <s>[INST] (S45 Fault) Feedback DataLoss Factory Limit Over Fault Hello All, I've seen S45 fault for 9 months this year. Our system configuration is VPL (VPL-B0631T-CK12AA) with Kinetix5700. Actually, we are running that axis without S45 fault for 1.3 year. But we saw higher frequency occuring trend after 1st fault. (2nd fault 60days, 3rd fault 30days, 4th fault 10 days...) We did actions to solve S45 fault. Cheked grounding, cable/connector status, torque and so on. But there's no specific clue. In the end, we've not seen S45 fault after motor/cable replacement. But I don't know hardware was a root cause of this fault. Because we didn't see any fault during 24/7 offline test using disassembled drive/motor and cable. Do you guys have similar experience? And do you knot the correct meaning and definition of feedback data loss factory limit over? Also, how is the relation ship between factoru limit and user limit? We've trouble situation because S45 fault can't be setup as status-only or alarm. It always connect to line stop whe the fault is occured. Plese help me solve this problem. [/INST] Hello Hans I understand your concerns and I will give you some information and direction for your investigation. The Servo fault S45 Motor Feedback Data Loss occurs because the number of consecutive missed or corrupted serial data packets from the feedback device has exceeded a factory set limit. Basically, communication was not established with an intelligent encoder, either due to misconfiguration, or some sort of hardware problem. the S45 fault can have multiple causes. the fact that you are not able to reproduce the error in offline test can be explained. Because the test is not executer in the same machine environment, with same cable length, with same FW, with same noise environment, cable damaged, banding radius, EMC skin effect ...Etc The RSSI : on the inverter display you can access to different menu. In Diagnostic and them encoder Diagnostic you will found multiple information (they can vary depending of the FW... with new FW you have more information's) . to read the diagnostics your drive and motor must be part of an application. The RSSI indicate the quality of the signal (look at the manual Multi-Axis Control Servo Drives Technical Documentation | Rockwell Automation).This RSSI is a very good indicator of the signal quality. You can also access the diagnostics via the drive web interface with an ethernet browser (make sure that the WEB is enable in the drive display interface)... this more convenient and you can take screenshot. with the webpage you can also access to the extended fault (FaultSubCode) Rockwell Knowledge base : check the different article related to S45 fault . (some example bellow) https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1125944 https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/585056 you can't modify the limits or Change the status of this error to my knowledge So check the encoder diagnostics with the system in place , and check the different recommendations in the links provided above. regards \\n </s>