Honeywell FC-SDO-1624 Safety Digital Input Module

Product Description

The FC-SDO-1624 is a high-integrity digital input module designed for use within the Honeywell Fail-Safe Controller (FSC) and Safety Manager ecosystems. Despite its model designation, this module functions as a 16-channel discrete input interface, providing a reliable connection between field-mounted safety devices and the central safety logic solver.

Built for high-availability Safety Instrumented Systems (SIS), the FC-SDO-1624 is widely deployed in high-risk industries such as oil & gas, chemical processing, and petrochemical production. Its robust design ensures accurate state detection of safety-critical signals under harsh electrical and environmental conditions.

Operating across a wide 18–30 VDC input range, the module maintains dependable signal acquisition even during power fluctuations. Low per-channel current consumption minimizes thermal load on the safety rack, while its IP65-rated construction and extended temperature tolerance allow continuous operation in extreme climates and demanding industrial atmospheres.

Technical Specifications

Safety System Applications

The FC-SDO-1624 serves as a foundational element in automated protection layers, continuously monitoring the status of safety-critical devices such as:

• Emergency Shutdown (ESD): Manual call points, E-stop pushbuttons, and safety interlocks

• Fire & Gas (F&G) Systems: Discrete inputs from gas detectors and flame sensors

• Burner Management Systems (BMS): Flame scanners, valve limit switches, and permissive signals

Technical FAQ

What makes the FC-SDO-1624 suitable for hazardous areas?
The module is certified to ATEX and CSA standards, meeting stringent electrical and thermal requirements for hazardous locations when installed within an appropriately rated enclosure.

How does the < 25 ms response time affect system safety?
A response time below 25 ms allows the safety logic solver to recognize field state changes—such as an emergency stop—almost instantaneously, ensuring compliance with required Process Safety Time (PST) limits for hazard mitigation.