text: <s>[INST] Motion fail Hi everyone, I have a problem with my SERCOS ring. Does anyone have an idea why my SERCOS module goes to fault when my machine stops? I have three nodes the first one with 7 drives, the second one with 7 and the third one with 3. No error message is shown in the drives, but the servos do not run when we try to start the machine again. What I am doing is to reset the Kinetix system (6000) and it starts normally. Any help? Thanks [/INST] Hi Fraviere, I've no idea at the moment, but may have with a little more info. Does you sercos ring reboot (goes through the 1, 2, 3, 4 cycle sequence), or do you see an Error code displayed on one of the amplifiers (this would be an 'E' follwoed by maybe another one or two digits? You say your Sercos module goes into fault (what exactly is the fault indication), and you have 3 nodes - though I assume you mean 3 backplanes with a total of 17 axis? If this the case, how many sercos cards do you have ( 3 x 1756-M08's etc?). So quick summary:- 1). Sercos totally réboots going through sequence 1, 2, 3, 4 on each axis; yes or no2). All sercos cards stay healthy with solid green indicators; yes or no3). Any Error messages displayed on any specific axis?4). Firmware of the ControlLogix, and of the amplifiers - you can get this from RSLinx.5). Exact type & No. of Sercos cards?6). Is this a recent issue, or always been present? \\n </s>