The trunk-and-spur topology is accepted and often used. It is the de facto standard in process automation with fieldbus, because it is easy to engineer and easy to manage. A trunk-and-spur topology is made of power supplies and fieldbus couplers. Spurs are certified for your intrinsically safe instrumentation.
Your instrumentation connects to the fieldbus coupler, the DART Segment Protectors. The Segment Protectors are certified for installation in Zone 1 with outputs that are certified intrinsically safe Ex ib IIC. DART protects your plant from the very explosive gasses of group IIC. This means:
- The same components can be installed throughout your plant, even in different production sites
- Same spares holding throughout
- More familiarity for personnel means less training required
The DART Segment Protector provides sufficient power for device connections. Most importantly, it provides the short-circuit protection, which is critical when live maintenance is required on an instrument.