The installation of the panel PC proceeds in a very similar manner to that of the first master and should happen after the initial master installation but before the rest of the installs, so that further configuration can happen.
First, please plug the network in to this machine to the port labelled 'LAN A' and ensure that the master node is on. It will need network capacity through the master in order to install correctly.
Please use a USB stick of 4Gb capacity or larger and write the supplied ISO to it using a block-wise copier program, such as dd or Win32DiskImager. You can tell when this has been performed correctly as the partition layout of the USB stick will change, and provide an EFI-bootable partition second.
Put this USB stick into any available USB port on the panel PC, and power it up. As this is a full reinstall of the machine, and these machines are supplied with an OS already on board, this will involve inserting a USB keyboard and pressing the DEL key repeatedly on boot in order to access the BIOS console. From here, you can override the boot one time by selecting the EFI partition on your USB stick on the final tab.
This installer will then proceed in a hands-free manner and deploy a basic operating system (Ubuntu 18.04) onto the boot disk. Once complete, it will reboot, and finish its install by downloading some additional tools from the internet. It is then immediately ready to use, no further reboots required.