As you have seen, there is wiring on both sides of marshaling rack 101-MR-DCS 001. On the field (left) side of the marshaling rack, terminal strip FT-1 is connected to junction box 101-JB-DCS-001. The signals in this wiring segment are 101-FT-100, 101-FT-102, 101-FY-100, and 101-PT-201.
On the DCS (right) side of the marshaling rack, there are two terminal strips — one terminal strip (TP-1) for the analog inputs to the DCS of tags 101-FT-100, 101-FT-102, and 101-PT-201, and the other terminal strip (TP-2) for the analog output FY-100.
The missing link is the cross wiring between these three terminal strips. You will now connect them using the SmartPlant Instrumentation cross-wiring feature.