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Characterization Module (CHARM) Technology | DeltaV

Emerson Electronic Marshalling

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.

CHARM technology
This unprecedented flexibility comes from characterization module (CHARM) technology, which 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. Each device can be landed anywhere on the strip regardless of its signal type:  AI 4-20mA,  AO 4-20mA, AI 0-10V, TC, RTD, DI Dry or Namur, DO High Side, Relays Contact Outputs or Isolated DI and DO for higher currents or higher VAC Voltages. Simply click in a CHARM with the corresponding signal type, and the landing is done. After the CHARM is in place, the channel is electronically marshaled 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 thier 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. First available IS CHARMs signal types are: IS AI 4-20mA HART, IS AO 4-20mA HART, IS DI Namur, and IS DO 24 VDC.

DocumentationFeatures & BenefitsSpecifications
 Product & Service Documentation
 Data Sheets - Bulletins - Catalogs
 CTO CHARM Cabinets
The DeltaV Configure To Order CHARM Cabinets provide an predesigned solution for DeltaV CHARM I/O, assembled in industry standard cabinets, ready to be installed on-site and connected to the field I/O.
1 MBpdfOctober 2013
 CTO CHARM Field Enclosures
The DeltaV Configure To Order (CTO) CHARM Field Enclosures provide an off-the-shelf solution for faster project execution and reduced installation costs.
917 KBpdfJanuary 2015
 S-Series Electronic Marshalling
2 MBpdfOctober 2014
 S-series Electronic Marshalling for Migrations
Now you can migrate to DeltaV S-series without having to add cabinets, custom cables, or extra marshalling. All communications are completely redundant from the channel (CHARM) to the DeltaV S-series controller.
644 KBpdfApril 2010
 S-series IS Electronic Marshalling
The addition of Intrinsically Safe (IS) CHARMs provides significant savings in system design, installation cost and ease of maintenance expected with Electronic Marshalling.
1 MBpdfAugust 2013
 Technical White Papers
 DeltaV CHARM Commissioning
Whitepaper discusses features of CHARM IO Cards and commissioning of field wiring and devices prior to installation of balance of control system.
1 MBpdfDecember 2010
 DeltaV Enclosures
Describes the three types of DeltaV Enclosures available from Emerson Process Management, starting with the version 11 release of DeltaV. The details of the enclosures, as well as the benefits of using these enclosures, are described in this paper.
474 KBpdfJanuary 2013
 Effects of Heat and Airflow inside an Enclosure
In order to prevent problems during control system design, effects of heat and airflow on equipment installed in enclosures must be considered.
281 KBpdfFebruary 2007
 Electronic Marshalling Availability and Redundnacy
675 KBpdfJanuary 2013
 Electronic Marshalling Overview
Electronic Marshalling is an innovative design for connecting field devices to a DeltaV™ Process Automation System. This document provides a detailed overview of what Electronic Marshalling is, as well as describes the benefits that it provides.
1 MBpdfFebruary 2010v1
 I/O on Demand Cost Study
In this study, data from an existing offshore platform was analyzed to compare the as built cost with the cost of the new Electronic Marshalling technology in DeltaV v11.3. The results show cost savings of between 7 and 26%.
906 KBpdfFebruary 2010v1
 Modernizing Your Automation System with I/O on Demand
1 MBpdfFebruary 2011