Description

The Honeywell FC-SAO-0220m is a Safe Analog Output Module featuring two 0(4)–20 mA output channels engineered for high-integrity safety control applications within the Honeywell Safety Manager system. Operating as a critical output interface, the module converts internal digital system logic commands into precise analog current loops to regulate modulating final control elements, valves, and positioners in safety-critical loops.

Designed with internal safety architecture, each channel contains a 12-bit D/A converter for output signal generation and an integrated A/D converter that continuously reads back the actual output value. Within a configured Diagnostic Test Interval, the module automatically tests output channels for output value accuracy (within ±5%), de-energization capability, and cross-talk between outputs. Each channel features a secondary means of de-energizing (SMOD), enabling the watchdog and processor to de-energize the output independently of the application command value.

The Honeywell FC-SAO-0220m features conformal coating on all internal electronic assemblies (designated by the FC- prefix) to protect against airborne contaminants, dust, and aggressive industrial environments. The output channels are galvanically isolated from both the 24 Vdc internal power supply and the 5 Vdc logic supply.

Features

• Provides two 0(4)–20 mA safe analog output channels configurable as active or passive loops.
• Conformally coated PCB construction (FC- prefix) for reliable environmental protection.
• Dual-converter architecture utilizes a 12-bit D/A converter for driving current and an internal A/D converter for continuous signal read-back and self-testing.
• Incorporates continuous self-diagnostics verifying output current accuracy within ±5%, de-energization ability, and channel cross-talk.
• Secondary Means of De-energizing (SMOD) allows the watchdog or main processor to force channels to a de-energized state.
• Galvanically isolated outputs from the 5 Vdc and 24 Vdc supply buses.
• Supports both non-redundant and redundant Safety Manager I/O configurations starting as of Safety Builder release 120.

Applications

• Safety Instrumented Systems (SIS): Converts safety shutdown logic into precise 4–20 mA positioning signals for emergency isolation and modulating control valves.
• Burner Management Systems (BMS): Manages fuel-to-air ratio valves and flue gas damper actuators requiring safety-certified continuous signal conditioning.
• Fire & Gas (F&G) Mitigation Systems: Controls variable output speed drives and proportional deluge valves.
• Hazardous Location Control: Interfaces with non-incendive field circuits in Class I, Division 2 environments via approved terminal assemblies.

Technical Specifications

General

Electrical & Power Ratings

Output Channels & Performance

Mechanical Keying

Connections / Interfaces

Installation Guidelines

1. Confirm that the Honeywell FC-SAO-0220m module version (CCV1.0) matches system software project requirements.
2. Inspect the rear connector pins and keying hole locations (A9, C5) to ensure compatibility with the card guide positioning pins.
3. Ensure power to the target chassis section is safely disconnected before inserting the card, or verify hot-swap suitability in redundant configurations.
4. Align the card edge with the 4 TE chassis guide rails and push firmly into the backplane until properly seated.
5. Connect the 24 Vdc internal supply to prevent fault detection during automatic self-test procedures.
6. Short-circuit any unused output channels (link terminal 2 with 3 for channel 1, or terminal 6 with 7 for channel 2 on the TSAO-0220m FTA) to prevent fault reporting during self-diagnostic execution.
7. Do not connect inductive loads directly to the outputs; the module is designed exclusively for resistive or capacitive loads.

Maintenance & Replacement Recommendations

• Redundant Output Consideration: When replacing a module in redundant analog output configurations, note that a detected fault during self-testing may cause a minor current dip on the output before the Safety Manager switches control to the healthy redundant channel.
• Fault Inspection: If a channel fault LED lights up, verify that inductive loads have not been connected to the outputs and ensure that all unused channels are properly jumpered.

Compliance and Certifications

• CE Marked
• TÜV Certified
• UL Listed
• CSA Certified
• Factory Mutual (FM): FM 3611 Approved for Class I, Division 2, Groups ABCD and Class II, Division 2, Groups FG non-incendive field circuits in hazardous locations.