Electronic Marshalling allows for the seamless addition of I/O throughout the plant without impacting control room cabinets. It utilizes a single-channel component known as a CHARM (CHARacterization Module) to enable connectivity for various I/O types.
CHARMs enable the termination of field wiring for any signal type at any location, eliminating the need for marshalling cabinets or cross-wiring. This means no marshalling cabinet or cross-wiring, fewer wires, much less work, and fewer contact points for potential failures.