Remove The Complexity of Marshalling Field Wires
The DeltaV system’s Electronic Marshalling delivers the flexibility to add I/O anywhere in the plant without affecting the control room cabinets. No re-design, no re-wiring. Now you can accommodate late project changes without adding extra costs or impacting start-up schedule.
The CHARacterization Module (CHARM) technology brings unprecedented flexibility that allows field wiring of any signal type to be terminated anywhere. A CHARM is simply a single-channel component with an A/D converter and signal characterizer inserted onto the terminal block where field wires are landed.
This revolutionary approach removes the complexity of field wiring marshalling in your control system. Redundant CHARM I/O cards, communications, and power between CHARMs and CHARM I/O cards ensure system reliability. Simply click a CHARM into place with the corresponding signal type — the landing is complete. After the CHARM is in place, the channel is electronically marshalled to any controller in the system. This means no marshalling cabinet or cross-wiring, fewer wires, much less work, and fewer contact points for potential failures.
Electronic marshalling and the CHARM technology have proven their flexibility in installations, delivering up to 50% wiring savings over traditional wiring as well as eliminating traditional marshalling cabinets and cross-wiring. At the same time, they increase reliability while reducing maintenance costs, responding quickly and easily to late changes with no impact on startup scheduling.
Intrinsically Safe CHARMs
The addition of intrinsically safe (IS) CHARMs provides significant savings with Electronic Marshalling, with the added intrinsically safe circuitry for field wiring into hazardous areas, including Zone 1, Zone 0 or Class 1 Div1. I/O in hazardous areas traditionally requires costly explosion-proof mounting or isolation barriers, along with added space for barrier and termination, and ongoing maintenance to ensure compliance with safety requirements.
IS CHARMs deliver a reduced footprint and eliminate the need for separate barriers and the associated inter-cabinet wiring. A smaller footprint and fewer connections improve reliability and deliver significant cost savings.
IS barriers are integrated inside the IS CHARM to provide single channel fault isolation, as well as electrical isolation and energy limiting circuitry that meets IEC Ex ia ratings. Available IS CHARMs signal types are: IS AI 4-20mA HART, IS AO 4-20mA HART, IS DI NAMUR, and IS DO 24 VDC, as well IS RTD and TC.