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This paper reports on the design of the x-ray diagnostic beamline (XDBL1) dedicated to the emittance measurement of Elettra 2.0 storage ring. Elettra 2.0 is the Italian 4th generation diffraction limited storage ring (DLSR) light source currently under construction at the Elettra - Sincrotrone Trieste laboratory. It is designed to operate at 2.4 GeV, 400 mA and beam emittance of 212 pmrad. To characterize and monitor the beam size, the XDBL1 is foreseen to provide an online beam emittance measurement suitable for slow beam feedbacks. The XDBL1 is based on the x-ray pinhole camera (XPC) design for robust operation within the operational Elettra 2.0 parameters. The paper describes the beamline layout, the design constraints and the simulations results performed using OrAnge SYnchrotron Suite (OASYS). XOP under python3+orange3 sofwtare (XOPPY) was used to evaluate flux density and beamline transmission at key positions. Synchrotron Radiation Workshop (SRW) was used to calculate the monochromatic and polychromatic PSF for selected possible configurations. A description of the pinhole design and detections system are also provided. Provisions for future upgrades for machine configurations with more demanding resolution are also discussed.
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