WebIQ logs this error, because the OS reports Linux filesystem error 28 "No space left on device". This means that one of those can be the case: 1. The partition where WebIQ data is stored has no space left (Linux command to check: df -h) 2. The partition where WebIQ data is stored has no iNodes left (Linux command to check: df -i) You write "There is plenty of free space left - either on the programming PC and the ctrlX. Any suggestions?" - The error occurs where this message is logged - if it's from PLCnext that's where it occurs, if it's from the PC there this error occurs. I don't know where to find the info from 1. and 2. on ctrlX as you can't execute arbitraty command without root access which you usually don't have on an ctrlX.
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