The TS Series TRUNKSAFE system from MooreHawke, a division of Moore Industries (North Hills, CA), maintains continuous communication between a control system and instruments on a Foundation Fieldbus H1 segment. In the event of a failure on the Fieldbus segment, TRUNKSAFE enables the control system to switch immediately and automatically to a redundant path, preventing loss of a complete segment, shutdown of equipment, or other process failures.

The system also provides a hard-wired alarm to alert operators to the cable fault, and LEDs indicate exactly which cable and what type of fault has occurred. When the failed segment has been repaired and normal cable integrity restored, the previously disconnected H1 card is automatically allowed access to the segment again. An existing, non-redundant Fieldbus segment can be upgraded to a redundant system by adding an extra H1 card, two power conditioners, an extra Fieldbus cable, and replacing the existing coupler with a TRUNKSAFE device coupler. Implementing the TRUNKSAFE system requires no hardware or software modifications to the control system.

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