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Read and write the Extended registers can be acheived with the use of Extended memory 6X register read and write function blocks i.e. XMRD block for read and XMWT block for write. These blocks are only programmable in Concept under 984LL not in IEC function block and also the depends on the model of Quantum processor i.e. 140CPU21304 or 140CPU42402.
Document related to these function block are attached for the reference.