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Hi @john-fraser, welcome to the Community!
Not at all; what you have shown here is, at a glance, a very common type of installation. While we always encourage the use of a GX device in a system for the comprehensive information at-a-glance that it provides, it is not necessary; so long as all your other components are connected and programmed appropriately to the system, they will perform perfectly without a GX device tying them all together.
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