The Honeywell FC-SDO-0824 (also documented as FCSDO0824) is a high-reliability Safe Digital Output module designed for Honeywell’s Fail-Safe Control (FSC) and Safety Manager systems. This module is engineered to provide eight independent 24 VDC fail-safe outputs, making it a critical component for driving final elements such as solenoid valves, emergency shutdown (ESD) relays, and safety indicators. Its fundamental design principle is fail-to-safe, ensuring that in the event of a system failure, internal fault, or loss of communication, all outputs transition to a de-energized "safe" state.
Specifically developed for Safety Instrumented Systems (SIS), the FC-SDO-0824 is certified for use in SIL 3-capable loops according to IEC 61508. The module features comprehensive integrated diagnostics, including continuous line monitoring for open circuits and short circuits in the field wiring. It also incorporates a watchdog timer that monitors the module's internal health, effectively preventing "frozen" outputs. With a current capacity of up to 0.55A per channel (with some configurations supporting peaks up to 1A depending on thermal conditions), and a wide operating temperature range from –40 °C to +70 °C, it delivers consistent performance in the most demanding process environments, including offshore rigs and petrochemical refineries.
| Feature | Specification Details |
| Manufacturer | Honeywell |
| Model Number | FC-SDO-0824 / FCSDO0824 |
| Series | Fail-Safe Control (FSC) / Safety Manager |
| Module Type | Safe Digital Output (DO) |
| Output Voltage | 24 VDC |
| Number of Channels | 8 independent channels |
| Output Current | 0.55 A per channel (Nominal) |
| Safety Integrity Level | SIL 3 Capable (IEC 61508) |
| Diagnostics | Short circuit, open circuit, watchdog monitoring |
| Response Time | Typically < 20 ms |
| Operating Temperature | –40 °C to +70 °C |
| Isolation | Channel-to-system and channel-to-channel |
| Power Supply | 24 VDC via system backplane |
| Installation | Rack-mounted (FSC/Safety Manager Chassis) |
| Shipping Weight | 3.0 kg (6.6 lbs) |
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