AAT145-S03 | Yokogawa | CENTUM VP/FIO TC/mV Input Module

Product Overview

The Yokogawa AAT145-S03 serves as a high-precision Thermocouple (TC) and millivolt (mV) input interface for the CENTUM VP and CS 3000 FIO (Field network I/O) architectures. This rack-mountable PLC module captures sensitive low-level voltage signals from various thermocouple types and converts them into accurate digital process data. While the manufacturer has officially discontinued this series, we maintain 100% brand new, original factory stock to support legacy system expansions and critical hardware replacements without requiring a full system migration.

Part Number Breakdown: AAT145-S03

• AAT145: Thermocouple/mV Input Module (16-channel, isolated).

• -S: Standard type for general industrial process monitoring.

• 0: Always 0 (Standard hardware configuration).

• 3: Hardware revision optimized for specific FIO baseplate communications.

Technical Specifications

• Manufacturer: Yokogawa

• Input Channels: 16 Isolated Channels

• Input Signal Types: Thermocouples (Types J, K, E, T, R, S, B, N) and mV signals

• Installation: Rack Mountable (FIO Baseplate)

• Data Update Period: 1 second

• Weight: 0.32 kg (0.70 lbs)

• Power Consumption: 450 mA max (Supplied via system backplane)

• Condition: 100% Brand New Original

Engineering Advantages

The AAT145-S03 provides robust signal acquisition for demanding thermal environments through specific engineering features:

• Total Galvanic Isolation: Every channel features independent isolation from the system backplane. This architecture blocks ground loops and prevents electrical transients from field sensors from damaging the central DCS processors, maintaining system uptime during electrical faults.

• Cold Junction Stability: The module interfaces with specialized terminal blocks to provide accurate Cold Junction Compensation (CJC). This ensures that the system calculates the absolute temperature correctly even when ambient control room temperatures fluctuate.

• High-Density Rack Integration: The slim, rack-mountable design allows 16 channels to occupy minimal space on the FIO baseplate. This maximizes I/O density in crowded control cabinets, reducing the need for additional expansion nests.

• Legacy Hardware Lifecycle Extension: As a discontinued component, this brand new unit allows maintenance engineers to replace failing legacy modules immediately. This avoids the high costs and downtime associated with redesigning control loops for newer, incompatible module series.

FAQs

• Does this module include the terminal block?

  The AAT145-S03 typically requires a separate pressure-clamp or bolt-tightening terminal block. Ensure you utilize a terminal block with a built-in CJC sensor for accurate thermocouple measurements.

• Can I mix different thermocouple types on one AAT145-S03?

  Yes. The CENTUM VP system software allows you to configure the input type for each channel independently. You can monitor a Type K thermocouple on one channel and a -100 to 150 mV signal on another.

• How does the module handle a broken thermocouple wire?

  The AAT145-S03 incorporates an automatic burn-out detection circuit. If a sensor fails or a wire breaks, the module drives the signal to a pre-defined safety limit, triggering an immediate alarm in the DCS.

• Is this a refurbished or used unit since it is discontinued?

  No. We guarantee that this AAT145-S03 is 100% brand new and original. It remains in its original manufacturer packaging and includes our full 1-year warranty to guarantee performance.