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We also need a Cell Map to generate a lattice in the Periodic Lattice block. The Cell Map is made entirely separate from the Unit Cell. Its purpose is to define the layout of where each Unit Cell will go. To add a lattice to an implicit body, we use three types of Cell Maps: Rectangular, Cylindrical, and Spherical. 
The Cell Map governs where the Unit Cells will go (aligning the u, v, and w coordinates of each), allowing you to edit the size, radius, and cell counts. Each Cell Map block has a Volume input that uses an implicit body to define its extent and an optional Frame that defines the starting point and orientation of the map. 

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Rectangular Cell Map

The Rectangular Cell Map block generates a cell map across the input volume with cells of defined Cell Size in rectangular coordinates. This map serves as a layout for the lattice Unit Cells.
Note: The default Cell Map’s starting point is the Minimum point of the body’s bounding box. To change this starting point or the cell map’s orientation, add a Frame or Plane block to the optional Frame input.

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Cylindrical Cell Map

The Cylindrical Cell Map block generates a Cell Map with a cylindrical coordinate system that covers the entire input volume with cells using the specified Cell radius (U), Cell height (V), and Arc count (W). The Cell Map edges will be default curved to the cylindrical coordinate system. Check the Linear input to generate straight edges only.
Tip: As a general rule, check the linear input when using a Graph Unit Cell and uncheck it when using a TPMS Unit Cell in the periodic lattice block. However, this will vary depending on your application and design goals.
Note: The default Cell Map’s starting point is auto-computed based on the volume’s principal axes about the center of mass. To change this starting point or the cell map’s orientation, add a Frame block to the optional Frame input.

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Spherical Cell Map

The Spherical Cell Map generates a Cell Map with a spherical coordinate system that spans the entire input volume with cells using the specified Cell radius (U), Latitude count (V), and Longitude count (W). The Cell Map edges will be default curved to the cylindrical coordinate system. Check the Linear input to generate straight edges only.

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View Settings

When creating the Cell Map, you can isolate the block using ‘I’ and view the Full Map or Navigate the Map using the heads-up display. The Navigate and Full display modes are available in the Display tab of the Right Panel. The Navigate mode allows you to view individual cells.