VLANS help?

Hi, I was wondering if someone could assist me on wrapping around the idea on what im trying to do. Not sure if im complicating more then it is.

Currently have an a RUGGEDCOM RSG2300 switch which is connected to a Chasis model Pure Flex System 8721HC1 with 3 nodes. Within the flex system theres a Switch IBM Flex System EN2092 1Gb Ethernet Scalable Switch. The idea is to create another VLAN. Our main LAN is 10.50.0.0/23 we want to create VLAN for all PLC and industrial machinery with range 10.10.10.0/24 and be able to ping 10.50.0.0/23 I was testing with a pc using a static IP, i gave the pc 10.10.10.8/24 that PC is connected on the ruggedcom on port 25 VLAN 50 Untagged. On the Ruggedcom a cable connects on port 31 VLAN 50 TAGGED to port 05 of the pureflex switch. My question is do i need to tag or untag? and i also see an option for pvid? not sure if its needed? see picture

Thank you http://ift.tt/2AAvNz7