Honeywell Safety Manager FS Series Modules: FS-SMSB-ST-110

Technical Dossier

Product Details And Specifications

Honeywell Safety Manager FS Series Technical Notes

The Honeywell Safety Manager (SM/FS) series is a dedicated Safety Instrumented System (SIS) platform engineered to IEC 61508 SIL 2/3 standards. It is deployed across the most demanding process industries globally — including petrochemical complexes, LNG terminals, nuclear auxiliary systems, offshore platforms, and refinery critical-path units. The FS series represents the field-proven evolution of Honeywell's safety logic solver architecture, with installations spanning hundreds of sites across North America, the Middle East, and Asia-Pacific. Its modular backplane design, deterministic scan cycle, and certified redundancy configurations make it the reference platform for functional safety engineers specifying SIS upgrades or greenfield safety layer designs.

The Evolution of Safety Manager FS Series Architecture

Honeywell's safety controller lineage traces from the TotalPlant Solution (TPS) era through the Safety Manager (SM) platform, culminating in the FS (Fail-Safe) series with enhanced diagnostics and tighter integration with Experion PKS. Early SM controllers used a proprietary backplane bus with limited hot-swap capability. The FS series introduced a high-speed serial backplane (HSSB) that supports online module replacement without process interruption — a critical requirement for continuous-process industries with multi-year turnaround cycles.

The FS series is fully compatible with the Safety Builder engineering environment and supports IEC 61131-3 function block and ladder logic programming. Firmware versioning across the FS series must be managed carefully: mixing major firmware revisions across CPU and I/O modules within the same chassis is not supported and will result in a system fault. Legacy SM modules are not physically or electrically interchangeable with FS-series backplanes, requiring a structured migration plan when upgrading from SM to FS architecture.

Safety Manager FS Series Full Catalog & Functionalities (SKU List)

Controllers / CPUs

• FS-SCPU-0100: Safety Manager CPU module, single processor, SIL 2 rated, Ethernet I/O bus
• FS-SCPU-0200: Dual-redundant CPU module, SIL 3 capable, hot-standby failover <100ms
• FS-SCPU-0300: Triple modular redundant (TMR) CPU, 2oo3 voting architecture, nuclear-grade applications

Digital Input (DI) Modules

• FS-SDI-0800: 8-channel 24VDC digital input, SIL 2, line fault detection per channel
• FS-SDI-1600: 16-channel 24VDC digital input, SIL 2, configurable input filter time
• FS-SDI-0824: 8-channel 120VAC digital input, SIL 2, galvanic isolation per group
• FS-SDI-1624: 16-channel 120VAC digital input, SIL 2, surge-protected terminals

Digital Output (DO) Modules

• FS-SDO-0800: 8-channel 24VDC digital output, SIL 2, short-circuit and open-load diagnostics
• FS-SDO-0824: 8-channel relay output, SIL 2, 2A per channel, dry contact

Analog Input (AI) Modules

• FS-SAI-0400: 4-channel 4–20mA analog input, SIL 2, HART pass-through, 16-bit resolution
• FS-SAI-0800: 8-channel 4–20mA analog input, SIL 2, per-channel open/short diagnostics

Analog Output (AO) Modules

• FS-SAO-0400: 4-channel 4–20mA analog output, SIL 2, readback verification per channel

Communication / Network Adapters

• FS-SCOM-0100: Modbus RTU/TCP communication module, dual-port Ethernet
• FS-SCOM-0200: PROFIBUS DP slave adapter, 12Mbps, redundant bus support
• FS-SCOM-0300: Experion PKS integration module, FTE (Fault Tolerant Ethernet) interface

Backplane / System Bus Modules

• FS-SMSB-ST-110: Safety Manager system bus terminator module, required at the terminal slot of each FS-series chassis to properly terminate the high-speed serial backplane (HSSB) bus; prevents signal reflection and bus communication errors; non-intelligent passive termination device; mandatory for chassis integrity in all FS-series configurations

Power Supply Modules

• FS-SPSU-0100: 24VDC input power supply module, 10A output, redundancy-capable
• FS-SPSU-0200: 120/240VAC input power supply, auto-ranging, hot-swap capable

Sourcing Hard-to-Find & Obsolete Safety Manager FS Series Parts

The Safety Manager FS series has entered a mature lifecycle phase. Honeywell has transitioned active development focus to the Safety Manager SC platform, which uses a different hardware architecture and is not backward-compatible with FS-series chassis or backplanes. As a result, several FS-series modules — including bus terminators such as the FS-SMSB-ST-110, legacy communication adapters, and first-generation CPU variants — are no longer available through standard Honeywell distribution channels.

Quality Control for the Safety Manager FS Series Range

FS-series modules present specific test challenges due to their safety-rated backplane bus architecture and internal self-diagnostic firmware. DriveKNMS applies the following test protocol to all FS-series units prior to shipment:

• Backplane bus continuity verification: All HSSB connector pins are tested for continuity and impedance against OEM reference values. For passive terminator modules such as the FS-SMSB-ST-110, termination resistance is measured and verified against the specified 120Ω ±5% tolerance.
• Visual and mechanical inspection: PCB inspection under 10× magnification for solder joint integrity, capacitor condition, and connector wear. Locking tab and ejector lever function verified.
• Firmware revision identification: CPU and intelligent I/O modules are powered in an isolated test chassis to read and record firmware version. This data is included in the shipment documentation.
• Functional I/O test: All I/O modules are cycled through full-range signal tests using calibrated signal sources. Analog modules are verified for linearity and offset error within OEM specification.
• Burn-in soak: Modules are operated at elevated ambient temperature (50°C) for a minimum of 24 hours to screen for early-life failures prior to shipment.