Yokogawa AAI141-H00 S2 Analog Input
The Yokogawa AAI141-H00 S2, also cataloged as the AAI141-H00 S2 Analog Input Module, operates as a dedicated hardware component for multi-channel current signal acquisition within CENTUM CS and CENTUM VP DCS networks. It executes 16-channel 4-20 mA DC analog input conversions with 16-bit resolution across process transmitter loops.
Suffix Breakdown & Model Matrix
- AAI141: Base hardware identifier for 16-channel current input card (4-20 mA DC).
- -H: Integrated HART digital communication support for remote device diagnostics and variable reading.
- 00: Standard non-isolated channel architecture with common ground reference.
- S2: Hardware Revision Style 2, denoting enhanced internal semiconductor thermal dissipation.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AAI141-H00 S2 |
| Brand | Yokogawa |
| Origin | Standard Industrial Manufacturing |
| Weight | 0.5 kg |
| Dimensions | 100 mm x 130 mm x 30 mm |
| Operating Temp | Standard Cabinet Operating Limits |
| Power Consumption | Powered via 24 VDC System Bus |
| Input Channels | 16 channels |
| Input Signal | 4 to 20 mA DC |
| Resolution | 16-bit |
| Accuracy | +-0.1% of full scale |
| Input Isolation | Non-isolated |
| Communication Protocol | HART Protocol |
4-20 mA HART Loop Protocol and CJC Loop Integration
The module incorporates digital HART protocol overlaying the 4-20 mA analog signal path, enabling bi-directional parameter configuration and real-time secondary variable polling. Because channels share a non-isolated common ground structure, signal conditioning circuits filter out high-frequency noise and prevent cross-channel interference. Cold junction compensation (CJC) algorithms are managed at system marshalling panels when interfacing remote temperature transmitters via current transducers.
Frequently Asked Questions
Q: What grounding precautions must be observed due to the non-isolated channel architecture of the AAI141-H00 S2?
A: Since input channels share a common ground reference, all connected 4-20 mA loops must originate from isolated loop power supplies or isolated transmitters to prevent circulating ground currents across the card.
Q: How does HART communication pass through the analog signal chain without distorting 16-bit conversion?
A: HART frequency-shift keying (FSK) signals operate at higher frequencies (1200 Hz and 2200 Hz) overlaid on the 4-20 mA DC signal; internal active low-pass filtering removes these FSK components prior to A/D sampling.
Field Installation Guidelines
- Insert the module firmly into the CENTUM baseplate slot until the upper and lower locking levers snap into position.
- Route 4-20 mA current loop wiring using shielded twisted-pair conductors, terminating the cable shield at the designated cabinet grounding bar rather than on the module terminal block.
- Verify that the external 24 VDC loop power supply voltage remains steady under full 16-channel load conditions.
Yokogawa AAI141-H00 S2 Analog Input
Yokogawa AAI141-H00 S2 Analog Input
The Yokogawa AAI141-H00 S2, also cataloged as the AAI141-H00 S2 Analog Input Module, operates as a dedicated hardware component for multi-channel current signal acquisition within CENTUM CS and CENTUM VP DCS networks. It executes 16-channel 4-20 mA DC analog input conversions with 16-bit resolution across process transmitter loops.
Suffix Breakdown & Model Matrix
- AAI141: Base hardware identifier for 16-channel current input card (4-20 mA DC).
- -H: Integrated HART digital communication support for remote device diagnostics and variable reading.
- 00: Standard non-isolated channel architecture with common ground reference.
- S2: Hardware Revision Style 2, denoting enhanced internal semiconductor thermal dissipation.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AAI141-H00 S2 |
| Brand | Yokogawa |
| Origin | Standard Industrial Manufacturing |
| Weight | 0.5 kg |
| Dimensions | 100 mm x 130 mm x 30 mm |
| Operating Temp | Standard Cabinet Operating Limits |
| Power Consumption | Powered via 24 VDC System Bus |
| Input Channels | 16 channels |
| Input Signal | 4 to 20 mA DC |
| Resolution | 16-bit |
| Accuracy | +-0.1% of full scale |
| Input Isolation | Non-isolated |
| Communication Protocol | HART Protocol |
4-20 mA HART Loop Protocol and CJC Loop Integration
The module incorporates digital HART protocol overlaying the 4-20 mA analog signal path, enabling bi-directional parameter configuration and real-time secondary variable polling. Because channels share a non-isolated common ground structure, signal conditioning circuits filter out high-frequency noise and prevent cross-channel interference. Cold junction compensation (CJC) algorithms are managed at system marshalling panels when interfacing remote temperature transmitters via current transducers.
Frequently Asked Questions
Q: What grounding precautions must be observed due to the non-isolated channel architecture of the AAI141-H00 S2?
A: Since input channels share a common ground reference, all connected 4-20 mA loops must originate from isolated loop power supplies or isolated transmitters to prevent circulating ground currents across the card.
Q: How does HART communication pass through the analog signal chain without distorting 16-bit conversion?
A: HART frequency-shift keying (FSK) signals operate at higher frequencies (1200 Hz and 2200 Hz) overlaid on the 4-20 mA DC signal; internal active low-pass filtering removes these FSK components prior to A/D sampling.
Field Installation Guidelines
- Insert the module firmly into the CENTUM baseplate slot until the upper and lower locking levers snap into position.
- Route 4-20 mA current loop wiring using shielded twisted-pair conductors, terminating the cable shield at the designated cabinet grounding bar rather than on the module terminal block.
- Verify that the external 24 VDC loop power supply voltage remains steady under full 16-channel load conditions.
