Yokogawa AAR145-S50 CENTUM VP RTD/POT Input Module
The Yokogawa AAR145-S50, also cataloged as the AAR145-S50 RTD/POT Input Module, operates as a dedicated hardware component for temperature and position signal acquisition within CENTUM VP DCS platforms. This 16-channel unit conditions resistance temperature detector (Pt100) and potentiometer signals into internal digital data blocks across field control stations.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AAR145-S50 |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | 0.3 kg |
| Dimensions | Standard CENTUM VP module slot size |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | 350 mA at 5 VDC |
| Input Channels | 16 isolated channels |
| Supported Sensor Types | Pt100 RTD (3-wire), Potentiometer |
| Potentiometer Input Range | 100 ohm to 10 kohm |
| Input Voltage Rating | ±5 V |
| System Architecture | Yokogawa CENTUM VP / CENTUM CS 3000 |
Process Control & Fieldbus Interface Performance
The module integrates channel-to-channel isolation circuits to block ground loop noise across analog sensor loops. Cold junction compensation (CJC) algorithms run alongside internal analog-to-digital conversion routines, maintaining signal integrity before passing data to controller nodes. Compatibility with 4-20 mA HART loop protocol physical layers and FOUNDATION Fieldbus network segments allows seamless signal mapping inside system engineering environments.
Frequently Asked Questions
Q: Can the AAR145-S50 module accept 2-wire or 4-wire RTD configurations?
A: The module is optimized for 3-wire Pt100 RTD sensors to balance wire resistance compensation across all 16 isolated channels.
Q: Does the AAR145-S50 support online replacement while system power is applied?
A: Yes, inside compatible Yokogawa I/O terminal bases, operators can swap modules under power without interrupting field bus communication or adjacent card operations.
Q: How does the card handle open-circuit sensor faults on potentiometer inputs?
A: Internal diagnostic routines detect out-of-range resistance values (outside 100 ohm to 10 kohm) and transmit upscale/downscale fault flags directly to the DCS controller.
Field Installation Guidelines
Mount the card into the designated I/O slot of the Yokogawa terminal board until the side latches click firmly. Route field wiring using individually shielded 3-wire twisted cables for Pt100 sensors and potentiometer circuits. Connect all cable shields to the dedicated system ground bus on the enclosure frame at a single ground point to eliminate high-frequency noise interference. Maintain physical separation between signal cables and high-voltage AC distribution power cables within the panel ducts.
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