What are the basic rules for fieldbus segment design?

Fieldbus segment design rules: maximum cable length (Foundation Fieldbus H1: 1900m with repeaters, single segment 1000m), maximum devices per segment (typically 16-32 depending on power budget), minimum 1m between taps, trunk-spur topology (main cable with short spurs to devices), proper termination (resistive terminators at both ends of trunk), power supply sizing (calculate device current requirements), and grounding (single-point ground per segment). Consider: intrinsic safety barriers for hazardous areas, spare capacity for future devices, and cable type (Type A preferred for long runs). Use segment design tools provided by fieldbus foundations for validation.