The Honeywell 51405098-100, also known as the LCNP4E interface card, is a legacy network interface module used in industrial automation systems. Designed to support communication between controllers and distributed control systems (DCS), this card played a key role in process automation networks.

Although the 51405098-100 has been officially discontinued by Honeywell, it may still be available through select industrial surplus or third-party suppliers. It remains a useful solution for legacy systems requiring reliable communication support between PLCs and other control devices.