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YOKOGAWA AAI141-H00/K4A00 CENTUM Analog Input Module

Configured for Specific Technical Task in CENTUM VP / CS 3000 Field Control Stations, the YOKOGAWA AAI141-H00/K4A00 (AAI141 Analog Input Module) provides direct physical/electrical execution.

Suffix Breakdown & Model Matrix

Code Type Description
AAI141 Base Model Analog Input Module (4 to 20 mA, 16-channel, Non-Isolated)
-H Suffix Code With digital communication (HART protocol)
0 Suffix Code Always 0
0 Suffix Code Basic type
/K4A00 Option Code With KS Cable Interface Adapter [Model: ATK4A-00]

Hardware Specifications

Parameter Specification
Model AAI141-H00/K4A00
Brand Yokogawa
Origin Japan
Weight 3.0 kg (Shipping Weight) / 0.8 kg (Net Weight)
Dimensions 260 x 180 x 60 mm
Operating Temp -10 deg C to +60 deg C
Power Consumption 24 VDC nominal
Input Range 4-20 mA DC (0-25 mA permissible) with HART digital overlay
Channels 16
Resolution 16-bit A/D conversion
Accuracy +/-0.1% of full scale
Input Impedance 250 Ohm (current input)
Isolation Galvanic isolation per channel
Diagnostics Open-circuit, short-circuit, and HART communication error detection
Mounting Rack-mounted

HART Loop Protocol Integration

To establish digital interaction with smart field devices, the module utilizes the 4-20 mA HART loop protocol. It retrieves auxiliary process variables and calibration data by modulating high-frequency digital signals directly onto the analog loop without affecting the primary variable measurement. This digital overlay enables real-time instrument diagnostics and loop monitoring inside the CENTUM control network. Internal filter circuitry suppresses potential line noise to prevent attenuation of the frequency-shift keying (FSK) digital transmission.

Frequently Asked Questions

Q: Does the module support online maintenance inside the Field Control Station rack?

A: Yes, the module supports hot-swapping under powered conditions. An operator can replace a faulty module without disrupting the power supply or communication buses of neighboring modules in the same rack.

Q: What is the purpose of the /K4A00 option code included with this hardware assembly?

A: The /K4A00 option configures the module with the ATK4A-00 KS Cable Interface Adapter. This adapter allows direct plug-and-play terminal connections to field wiring termination blocks using standard system cables.

Q: How does the module indicate channel fault conditions to the host system?

A: The module runs continuous background diagnostics. If loop current drops below 3.6 mA, itflags an open-circuit fault, marks the specific channel data status as invalid, and issues an alarm to the operator station.

Field Installation Guidelines

  • Shield Grounding: Connect instrument cable shields to a dedicated, single-point instrument ground bar. Never ground the shield at both the field device and the cabinet to avoid induced ground loop currents.
  • Cable Routing: Maintain physical separation between the low-voltage analog input signal lines and high-voltage AC power distribution lines inside the cable trays to prevent electromagnetic noise induction.
  • HART Impedance Compatibility: Ensure the total loop impedance, including the 250 Ohm internal input impedance, is at least 250 Ohm to maintain reliable HART communication amplitude.

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