Honeywell FC-SAO-0220M Safe Analog Output Module

Product Overview

The Honeywell FC-SAO-0220M is a Safe Analog Output Module providing 2 channels of 4-20 mA output for Honeywell Safety Manager systems. Designed for safety-critical control applications, this module drives final control elements such as I/P converters, valve positioners, and variable speed drives with SIL-rated integrity. It features comprehensive diagnostics including line monitoring, short-circuit detection, and output readback verification.

Key Features

• 2 Safe Analog Outputs: 4-20 mA current output with HART pass-through capability
• SIL 3 Certified: Compliant with IEC 61508 for highest safety integrity
• Output Readback: Internal verification of actual output current vs. commanded value
• Line Monitoring: Detects open circuits and short circuits in field wiring
• HART Compatible: Supports HART digital communication on 4-20 mA signal
• Galvanic Isolation: Isolation between internal circuitry and field outputs
• Status LEDs: Per-channel and module diagnostic indicators

Technical Specifications

• Model: FC-SAO-0220M
• Type: Safe Analog Output Module
• Channels: 2 analog outputs
• Output Range: 4-20 mA
• Resolution: 12-bit
• Accuracy: ±0.1% of span
• Load Resistance: 0-750 Ω (typical)
• HART: Pass-through compatible
• Update Rate: ≤ 100 ms
• Power Requirements: 5 VDC: 120 mA; 24 VDC: 80 mA per channel
• Module Width: 4 TE (20.32 mm / 0.8 in)
• Space Requirements: 4 TE × 3 HE
• Operating Temperature: -40°C to +70°C
• Approvals: CE, TÜV, UL, CSA, FM

Installation Guide

1. Chassis Insertion: Slide module into designated slot; secure with screws
2. Flat Cable: Connect to horizontal IO bus (IOBUS-HBS or IOBUS-HBR)
3. Field Wiring: Use compatible FTA (e.g., FC-TSAO-0220M) for field connection
4. Load Verification: Ensure total loop resistance ≤ 750 Ω including field device
5. HART Configuration: Enable HART pass-through in Safety Manager engineering software if required

FAQ

Q: Can this module control valves directly?
A: The FC-SAO-0220M outputs 4-20 mA signals. It can drive I/P converters or valve positioners that accept 4-20 mA input. For direct solenoid valve control, use digital output modules.

Q: What happens during a fault condition?
A: The module detects open circuits, short circuits, and deviation between commanded and actual output. Faults are reported to the safety controller, which can initiate predefined safety actions.

Q: Is HART configuration required?
A: HART pass-through is optional. If HART devices are not used, standard 4-20 mA operation does not require HART configuration.

Selection Tips

• Use for final control element applications requiring 4-20 mA output
• Verify loop resistance including cable length and field device impedance
• Ensure paired FTA supports HART if HART devices are used
• For higher channel density, consider multiple SAO-0220M modules
• Include output readback verification in SIL loop calculations