Honeywell FC-SAO-0220M Fail-safe Analog Output Module

   The safe analog output module SAO-0220m has two 0(4)–20 mA output channels for analog control applications. The load may only be resistive or capacitive. Inductive loads will cause the analog output module to be reported faulty. The two analog outputs are galvanically isolated from the 24 Vdc and the 5 Vdc. The 0 V 1 (d14) pin and 0 V 2 (d20) pin are interconnected on the module.

   Each analog output channel consists of a 12-bit D/A converter for the output value and an A/D converter which reads the output value. By using the A/D converter, it is possible to check the correct functioning of the output channel.

Within the configured Diagnostic Test Interval, the analog outputs are tested for:

   1. Correct output value (current value ± 5%)

   2. Ability to de-energize

   3. Cross talk between analog outputs

   Each analog output has a secondary means of de-energizing (SMOD). This enables the watchdog and the processor to de-energize the outputs, irrespective of the result of the application value.

   The FC-SAO-0220M safe analog output module is designed for high-integrity control systems requiring precise and verifiable current outputs. It provides two configurable 0–20 mA or 4–20 mA channels with 12-bit D/A conversion and integrated A/D feedback for continuous output monitoring. Galvanic isolation from both 24 Vdc and 5 Vdc supplies enhances system safety and noise immunity. Built-in diagnostics verify output accuracy (±5%), de-energization capability, and channel cross talk within the defined test interval. The secondary means of de-energizing (SMOD) allows the watchdog or processor to force outputs to a safe state, ensuring dependable operation in safety-critical environments.

   The FC-SAO-0220M is well suited for safety-related analog control applications in process and industrial automation systems. It is commonly used to control valves, dampers, actuators, and drive reference signals where reliable 4–20 mA communication and safe shutdown behavior are essential. The module's support for resistive and capacitive loads makes it ideal for process instrumentation interfaces, while its diagnostic capabilities ensure early fault detection and system integrity. Integration into Safety Manager and Safety Manager A.R.T. systems allows the SAO-0220m to meet stringent functional safety requirements in industries such as oil and gas, chemical processing, power generation, and manufacturing automation.

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