Product Description

Overview

The Honeywell FC-SAO-0220m is a precision Fail-Safe Analog Output Module designed for the Safety Manager platform. It provides two isolated analog outputs (0–20 mA or 4–20 mA) for safe control of final elements such as control valves, actuators, or variable speed drives. Built for safety-critical loops, this module features full diagnostics and internal safeguards, ensuring it defaults to a safe state under fault conditions.

Key Features

Safety & Diagnostics

• SIL 3 Compliant: Meets IEC 61508 standards for high-integrity safety applications.

• Fail-Safe Operation: Outputs automatically move to a predefined safe value in case of a system or hardware fault.

• Watchdog Monitoring: Continuously checks internal health and communication integrity.

• High Precision: 12-bit digital-to-analog conversion guarantees accurate analog control signals.

Output & Power Flexibility

• Dual Power Modes: Supports both active (module-powered) and passive (externally powered) field wiring.

• Active Mode: Maximum loop resistance 600 Ω, max output voltage 30 Vdc.

• Passive Mode: Accepts external voltage up to 40 Vdc.

• Low Off-State Current: Less than 0.05 mA to prevent accidental actuation.

Electrical Protection & Robustness

• Galvanic Isolation: Protects Safety Manager internal electronics from field-side surges and interference.

• Low Power Draw: 30 mA at 5 Vdc and 65 mA at 24 Vdc (excluding output current).

• Diagnostic Checks: Periodically verifies output accuracy, de-energization, and cross-talk between channels.

Maintenance & Indicators

• LED Status Indicators: Provides immediate feedback for module and channel health.

• Hot-Swap Ready: Can be replaced in redundant systems without shutting down the process.

Technical Specifications

Typical Applications

• Safety-Critical Control Loops: Precise modulation of control valves in Emergency Shutdown (ESD) systems.

• Variable Speed Drives: Safe setpoint control for pumps, fans, or compressors.

• Actuator & Damper Positioning: Reliable output control in Burner Management Systems (BMS).

FAQ

Q: Can this module be used in both active and passive wiring configurations?
A: Yes, it supports active (module-powered) and passive (externally powered) outputs for flexible installation.

Q: What is the maximum loop resistance in active mode?
A: The maximum loop resistance is 600 Ω with a maximum output voltage of 30 Vdc.

Q: Does it provide SIL 3 safety integrity?
A: Yes, the FC-SAO-0220m is SIL 3 certified, suitable for high-integrity safety loops.

Comparison with Similar Modules

• FC-SAO-0120m: Single-channel analog output for smaller systems.

• FC-SAO-0420m: Four-channel analog output for higher-density applications.