Honeywell TSAI-1620M Analog Input Module – TotalPlant Solution (TPS) Series
When an analog input module fails in a continuous process plant — a refinery column, a boiler drum, or a pharmaceutical reactor — the control system loses its eyes. Without accurate field signal acquisition, the DCS cannot execute regulatory control loops, safety interlocks begin operating on stale data, and operators are forced into manual mode under process pressure. Unplanned downtime in these environments routinely costs tens of thousands of dollars per hour. The Honeywell TSAI-1620M is the component that prevents this scenario: a dedicated 16-channel analog input module engineered specifically for the TotalPlant Solution (TPS) distributed control architecture, where signal integrity and deterministic scan performance are non-negotiable.
Within the TPS product family, the TSAI-1620M occupies the high-density analog input tier. Its FC-TSAI-1620M designation indicates the field-connection variant, designed to interface directly with marshalling cabinets and field junction boxes via the standard TPS I/O termination system. Honeywell’s TPS platform remains one of the most widely deployed DCS architectures in heavy process industries globally, with an installed base spanning refineries, petrochemical complexes, power generation facilities, and specialty chemical plants across North America, the Middle East, and Asia-Pacific. Replacement and spare modules for this platform are actively sourced by maintenance engineers worldwide, making the TSAI-1620M a high-priority stocking item for any TPS-based facility.
Technical Specifications
Electrical
- Number of Channels: 16 analog input channels
- Input Signal Types: 4–20 mA (current loop), compatible with HART field devices
- Input Impedance: 250 Ω (typical, current input)
- Resolution: 12-bit A/D conversion (4096 counts)
- Accuracy: ±0.1% of full scale (typical at 25°C)
- Common Mode Rejection: ≥ 120 dB at 50/60 Hz
- Channel Isolation: Channel-to-channel and channel-to-backplane isolation provided
- Power Consumption: Per TPS I/O bus specification
Mechanical
- Form Factor: Single-slot TPS I/O module card
- Connector: TPS standard backplane edge connector
- Part Numbers: TSAI-1620M (module) / FC-TSAI-1620M (field connection assembly)
- Weight: Approximately 300 g
- Mounting: TPS I/O carrier / file rack
Environmental
- Operating Temperature: 0°C to +60°C
- Storage Temperature: -40°C to +85°C
- Relative Humidity: 5% to 95% non-condensing
- Vibration / Shock: Per Honeywell TPS environmental qualification
Certifications & Standards
- Designed and qualified to Honeywell TPS system standards
- Compatible with IEC 61511 functional safety management framework (system-level)
- CE marking per applicable EU directives (verify with current Honeywell documentation)
Note: Specifications are based on Honeywell TPS product documentation. Always verify against the applicable revision of the Honeywell TPS I/O Module specification sheet for your system configuration.
Key Features & Benefits
- 16-Channel High-Density Input — Consolidates 16 field signal terminations into a single module slot, reducing cabinet footprint by up to 50% compared to 8-channel alternatives and lowering spare-parts inventory complexity.
- 4–20 mA Universal Current Loop Compatibility — Accepts standard two-wire and four-wire transmitter configurations, covering the full range of pressure, temperature, flow, and level instruments found in process plants without additional signal conditioning hardware.
- 12-Bit A/D Resolution — Provides 4096-count resolution across the input span, sufficient for regulatory PID control loops where ±0.1% accuracy is required to maintain product quality specifications.
- Channel-to-Channel Isolation — Prevents ground loops and common-mode interference from propagating between field circuits, a critical requirement in plants where field wiring runs share cable trays with power conductors.
- Hot-Swap Compatible with TPS Architecture — Supports module replacement under power in TPS redundant configurations, enabling corrective maintenance without process shutdown — directly aligned with IEC 61511 requirements for online proof testing.
- Direct Backplane Integration — Plugs into the standard TPS I/O file without tools or jumper configuration, eliminating commissioning errors and reducing mean time to repair (MTTR) during emergency replacements.
Industry & Equipment Applications
- Oil & Gas Refining — Crude distillation unit (CDU) column temperature profiling, hydrocracker reactor bed temperature monitoring, and atmospheric residue desulfurization (ARDS) pressure control loops.
- Petrochemical & Chemical Processing — Ethylene cracker furnace pass flow balancing, polymerization reactor jacket temperature control, and chlor-alkali cell voltage monitoring via 4–20 mA transmitters.
- Power Generation — Boiler drum level and feedwater flow acquisition for drum level three-element control, turbine lube oil pressure monitoring, and flue gas oxygen analyzer signal input.
- Pulp & Paper — Digester pressure and temperature loop inputs, bleach plant chemical dosing flow measurement, and paper machine headbox consistency control.
- Pharmaceutical & Biotech — Bioreactor dissolved oxygen and pH transmitter signal acquisition in GMP-regulated batch processes where audit-trail data integrity is mandatory.
- LNG & Gas Processing — Cryogenic heat exchanger temperature profiling, compressor suction/discharge pressure monitoring, and molecular sieve regeneration temperature control in gas dehydration units.
System Integration & Compatible Parts
Upstream / Downstream Components:
- TPS I/O File / Carrier Rack — houses the TSAI-1620M and provides backplane power and communication
- Honeywell TPS Highway Interface Module (HIM) — connects the I/O file to the UCN/LCN control network
- Honeywell PM/APM/HPM Controllers — process the digitized signals from the TSAI-1620M for control execution
- Field Termination Assembly (FTA) — marshals field wiring to the FC-TSAI-1620M connector
- HART Multiplexer (optional) — enables HART device management over the 4–20 mA loop
Equivalent / Replacement Considerations:
- FC-TSAI-1620M is the field-connection assembly variant of the same module — both part numbers are required for a complete installation
- TSAI-1620 (without the M suffix) — earlier revision; verify firmware and hardware compatibility with your TPS system revision before substitution
- Cross-platform substitution (e.g., to Experion PKS I/O) requires a formal Honeywell migration assessment and is not a drop-in replacement
Our Quality Assurance Process
Every TSAI-1620M module shipped from Konmask.com passes through a four-step verification process:
- Visual & Physical Inspection — Board-level examination for component damage, corrosion, bent connector pins, and label integrity. Modules with any physical anomaly are quarantined and not listed for sale.
- Functional Power-On Test — Module is energized in a compatible TPS test rack to verify backplane communication, channel enumeration, and self-diagnostic pass status.
- Signal Accuracy Verification — Representative channels are stimulated with calibrated 4–20 mA current sources to confirm A/D conversion accuracy within specification.
- Documentation & Traceability — Each unit is assigned an internal inspection record. Available documentation upon request: test report, photographs of physical condition, and certificate of conformance (CoC).
How to Order
- Submit Your Inquiry — Contact us via the form on this page or email support@konmask.com with your required part number (TSAI-1620M or FC-TSAI-1620M), quantity, and any urgency requirements.
- Receive Quotation & Availability Confirmation — Our technical team will respond within 24 hours with pricing, lead time, and stock status. For urgent plant shutdowns, please indicate your required delivery date.
- Confirm & Ship — Upon order confirmation, modules are inspected, packed in anti-static ESD packaging, and dispatched with full tracking. Export documentation is prepared for international shipments.
Why Choose Konmask.com?
- Specialized DCS & PLC Inventory — We focus exclusively on industrial automation components. The TSAI-1620M is not a sideline product for us — it is our core business.
- Technical Pre-Sales Support — Our team can advise on compatibility, revision differences, and substitution risks before you commit to a purchase — reducing the risk of ordering the wrong part.
- Global Export Experience — We ship to refineries, power plants, and process facilities across Asia, the Middle East, Europe, and the Americas, with experience in export documentation for controlled industrial goods.
- ESD-Safe Handling & Packaging — All modules are handled in ESD-controlled environments and shipped in anti-static bags with foam cushioning to prevent transit damage to sensitive electronics.
- Responsive Communication — 24-hour inquiry response commitment. We understand that a missing spare module can hold up a plant restart — we treat your timeline as our priority.
Frequently Asked Questions
Q: What is the difference between the TSAI-1620M and the FC-TSAI-1620M, and do I need both?
A: The TSAI-1620M is the I/O module card that plugs into the TPS I/O file backplane. The FC-TSAI-1620M is the field connection assembly (FCA) — the termination board that connects your field wiring to the module. In most TPS installations, both are required for a complete, functional channel. If you are replacing only a failed module card (and the FCA is intact), you need only the TSAI-1620M. If the termination board is also damaged, you will need the FC-TSAI-1620M as well. Contact us if you are unsure — we can help you identify which component has failed.
Q: Is the Honeywell TSAI-1620M compatible with Experion PKS or other newer Honeywell DCS platforms?
A: The TSAI-1620M is designed for the TotalPlant Solution (TPS) I/O architecture and is not directly compatible with Experion PKS Series C or later I/O systems, which use a different backplane and communication protocol. Honeywell offers formal migration paths from TPS to Experion, but these involve engineering assessment and are not plug-in replacements. If you are running a TPS system and need to maintain it, the TSAI-1620M is the correct spare. If you are planning a migration, we recommend consulting your Honeywell account team for a migration scope assessment.
Q: Can I use the TSAI-1620M analog input module with HART-enabled field transmitters for asset management?
A: The TSAI-1620M supports 4–20 mA input signals, which is the physical layer used by HART devices. However, native HART communication (the digital signal superimposed on the 4–20 mA loop) requires either a HART-capable I/O module or an external HART multiplexer connected to the loop. If HART asset management is a requirement for your application, please specify this when submitting your inquiry so we can advise on the appropriate configuration.
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