Relay control based on Virtual Value (D105-12)

Hello,

I am using a D105-12 and have created a Virtual Value (Arithmetic Operation) to calculate ΔT between two temperature channels (Tsupply − Treturn).

However, in Condition Management the Virtual Value does not appear as an available data source for relay control — only the physical channels (T1, T2, ADC, etc.) are listed.

Could you please clarify:

1. Is it possible to control the relay of D105 based on a Virtual Value?

2. If yes — is a specific firmware version or configuration required?

3. If not — is this functionality planned for a future firmware update?

I am using the Virtual ΔT specifically for heat pump defrost detection, so direct relay control based on Virtual Value would be very useful.

Thank you in advance.