That is the way I see it too.Let me make sure I understand what you're working with. You have a PC (192.168.0.???), a PLC (192.168.0.100) and an HMI (192.168.0.101).
They are all connected through a switch???
The PC at 192.168.0.??? can download a program to the HMI at 192.168.0.101
The PC at 192.168.0.??? can not establish a connection with the PLC at 192.168.0.100, nor can it ping IP address 192.168.0.100.
Can the HMI at 192.168.0.101 communicate with the PLC at 192.168.0.100???
I would agree with Steve's post # 7 to try a command line "arp -d" and reset the table.
Except I have never heard of "Set Temporary IP Address" causing the need for this?
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