Are you sure about your hardware, setup and configuration of the system as I cannot locate any dedicated communication routines in your backup that suggests any TCP/IP communication exchange is taking place between the Kawasaki and the seam tracker.
From this I can only assume your timestamp is being generated from the laser seam tracker when it receives requests to start welding etc.
I can only assume this issue will be related to your external peripherals and not the Kawasaki.