Description
Core Product Summary (Brand / Model / Key Attributes)
The Honeywell FS-SAI-1620MA (also designated FS-SAI-1620M / FS-SAI-1620m) is a high-density safe analog input module for the Honeywell Safety Manager system. It provides 16 channels of analog input with an input range of 0–4.1 V, supporting 0–20 mA and 4–20 mA field signals when used with a compatible Field Termination Assembly (FTA).
The module is designed for safety-related applications up to SIL 3 (IEC 61508). It features a 12-bit A/D converter, module inaccuracy of less than 0.25 %, crosstalk greater than 60 dB, and an absolute maximum input rating of ±36 V DC. Power requirements are 5 V DC at 35 mA and 24 V DC at 35 mA. The form factor is 4 TE × 3 HE (4 HP × 3U). Approvals include CE, TUV, UL, CSA and FM.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Product Type | Safe analog input module |
| Model | FS-SAI-1620MA / FS-SAI-1620M / FS-SAI-1620m |
| System | Honeywell Safety Manager |
| Number of Channels | 16 analog inputs |
| Input Range | 0–4.1 V |
| Input Resistance | > 1 MΩ |
| Maximum Load Capacitance | 100 nF |
| A/D Converter | 12-bit |
| A/D Converter Inaccuracy | ±1 LSB |
| Module Inaccuracy | < 0.25 % |
| Absolute Maximum Input | ±36 V DC |
| Crosstalk Between Channels | > 60 dB |
| External Voltage Readback | 0–4.1 V (typical input resistance 1 MΩ) |
| Power Requirements | 5 V DC, 35 mA; 24 V DC, 35 mA |
| Space Requirements | 4 TE, 3 HE (4 HP, 3U) |
| Approvals | CE, TUV, UL, CSA, FM |
| Safety Classification | SIL 3 (IEC 61508) |
Detailed Product Overview
The Honeywell FS-SAI-1620MA is a 16-channel safe analog input module used in Honeywell Safety Manager systems for high-integrity acquisition of process signals. The module accepts voltage signals in the range 0–4.1 V. When interfaced with a suitable Field Termination Assembly (such as the TSAI-1620M series), it supports standard 0–20 mA and 4–20 mA transmitter loops.
All 16 channels share an isolated analog 0 V common and are classified as safe (SIL 3 in accordance with IEC 61508). A 12-bit A/D converter digitizes the input signals with an inaccuracy of ±1 LSB; overall module inaccuracy is specified at less than 0.25 %. Crosstalk between channels exceeds 60 dB, minimizing interference in high-density installations. The absolute maximum input rating of ±36 V DC provides protection against over-voltage conditions.
An additional external voltage readback input (0–4.1 V) is provided for diagnostic monitoring of the supply or reference voltage. The module occupies a compact 4 TE × 3 HE slot in the Safety Manager chassis and draws 35 mA from both the 5 V and 24 V system supplies. Agency approvals include CE, TUV, UL, CSA and FM, supporting use in Class I Division 2 locations when installed in an appropriately rated enclosure.
The FS-SAI-1620MA is typically selected for safety-critical analog monitoring in emergency-shutdown, fire-and-gas, and other Safety Instrumented System applications that require high channel density and certified safety performance.
FS-SAI-1620MA
FS-SAI-1620MA
System Compatibility & Integration Requirements
| Item / Dependency | Verified Compatibility or Requirement | Practical Note |
|---|---|---|
| Host System | Honeywell Safety Manager | Installs in Safety Manager IO chassis |
| Field Signals | 0–4.1 V direct; 0–20 mA / 4–20 mA via FTA | Use compatible FTA (e.g., TSAI-1620M series) for current loops |
| Power | 5 V DC (35 mA) and 24 V DC (35 mA) | Supplied by Safety Manager power architecture |
| Safety Rating | SIL 3 (IEC 61508) | Suitable for safety-related analog input functions |
| Hazardous Area | Class I Division 2 (with appropriate enclosure) | Confirm local certification requirements |
| Diagnostics | External voltage readback input | Supports continuous monitoring of reference voltage |
| Form Factor | 4 TE × 3 HE (4 HP × 3U) | Matches standard Safety Manager module slots |
Engineering Selection Highlights
- 16 safe analog channels in a single module → high channel density for Safety Manager systems.
- 0–4.1 V input range with FTA support → compatible with standard 0–20 mA / 4–20 mA field transmitters.
- Module inaccuracy < 0.25 % and 12-bit conversion → suitable for precise process-variable measurement.
- Crosstalk > 60 dB → maintains signal integrity in dense multi-channel installations.
- SIL 3 capability (IEC 61508) → supports safety-related applications up to the highest integrity level.
- Compact 4 TE × 3 HE form factor → efficient use of chassis space.
- Dual power supplies (5 V and 24 V at 35 mA each) → low system power contribution.
- Agency approvals (CE, TUV, UL, CSA, FM) → facilitates use in regulated and hazardous-area environments.
Dimensions, Mounting & Connection Notes
- Space requirement: 4 TE, 3 HE (4 HP, 3U)
- Mounting: Safety Manager chassis slot
- Connector key coding: Module holes A5, C25; chassis pins A5, C25 (prevents incorrect insertion)
- Field interface: Via Field Termination Assembly for current-loop signals
(Exact terminal assignments, FTA wiring and configuration details are defined in the official Honeywell Safety Manager hardware documentation for the SAI-1620m family.)
FAQ
What is the Honeywell FS-SAI-1620MA?
It is a 16-channel safe analog input module for the Honeywell Safety Manager system, designed for high-integrity acquisition of process signals.
What input range does the module support?
The direct input range is 0–4.1 V. With a compatible Field Termination Assembly it supports 0–20 mA and 4–20 mA transmitter signals.
How many channels are provided?
Sixteen analog input channels, all classified as safe (SIL 3).
What is the module accuracy?
Module inaccuracy is less than 0.25 %. The 12-bit A/D converter has an inaccuracy of ±1 LSB.
What power does the module require?
5 V DC at 35 mA and 24 V DC at 35 mA.
Is the module suitable for safety applications?
Yes. It is designed for safety-related use up to SIL 3 in accordance with IEC 61508 and carries CE, TUV, UL, CSA and FM approvals.
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