Description

FC‑SDO‑0824 Safe Digital Output Module

Technical Specifications

• Product Model: FC‑SDO‑0824
• Brand: Honeywell
• Warranty: One Year
• Input Voltage: 24 VDC field supply; 5 VDC backplane logic power
• Operating Temperature: -40 °C to +70 °C (current derating above 45 °C)
• Storage Temperature: -40 °C to +85 °C
• Response Time: ≤10 ms safety‑loop actuation; fault detection <15 ms
• Protection Class: IP20 (rack‑mount cabinet‑only assembly)
• Accuracy Class: SIL‑3 capable solid‑state safety output switching
• Output Frequency: Not applicable (discrete safety output module)
• Rated Current Range: 0.55 A per channel continuous; thermal derating at elevated ambient temperature
• Communication Interface: Safety Manager rack backplane connector; ribbon cable interface to matching FTA
• Supported Protocols: Internal Safety Manager safety backplane bus
• Overload Capacity: Per‑channel short‑circuit protection; watchdog fault‑safe forcing; galvanic channel‑to‑backplane isolation
• Dimensions: 120 mm × 74 mm × 28 mm

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Product Overview

The FC‑SDO‑0824 is an eight‑channel safe digital output processing module for Honeywell Safety Manager SIS platforms. It delivers solid‑state 24 VDC drive signals to safety‑critical final elements including solenoid shutdown valves, trip relays and emergency‑stop actuation hardware. Continuous on‑board line monitoring detects open‑circuit, short‑circuit and load‑coil faults for each channel, feeding diagnostic status back to the safety logic solver for event logging and alarm reporting. Conformal coated PCBA improves reliability in cabinet environments with humidity and airborne contaminant exposure.

This module addresses core functional‑safety challenges: deterministic fail‑safe behaviour upon internal hardware faults, comprehensive channel‑level diagnostics, and compliance with IEC 61508 SIL‑3 loop requirements. It works in simplex and TMR redundant system architectures and supports hot‑swap replacement within redundant racks without triggering safety trips. SIS design engineers, petrochemical and oil‑gas maintenance teams, and safety‑system retrofit integrators benefit most. It must pair with compatible field‑termination assemblies to complete field‑wiring connections, delivering drop‑in spare‑part functionality for ESD and fire‑gas protection systems across process‑industry facilities

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Key Application Notes

• Requires matched FTA field‑termination assembly such as FC‑TDOL‑0724P for field‑cable termination; no direct field‑wiring terminals on module
• Output current must be derated when cabinet ambient temperature exceeds 45 °C to maintain full safety‑rating performance
• TUV‑certified for deployment within SIL‑3 safety‑instrumented loops under IEC 61508 / IEC 61511 standards
• Watchdog timer forces outputs to safe de‑energized state if module internal processing faults occur
• Designed exclusively for safe‑area control‑room rack installation; field hazardous‑area wiring must follow approved installation practices

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