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Yokogawa AAV144-S00/A4S00 Analog Voltage Input Module

The Yokogawa AAV144-S00/A4S00, also cataloged as the AAV144 Analog Voltage Input Module, operates as a dedicated hardware component for analog voltage signal acquisition within CENTUM VP and CENTUM CS 3000 platforms. Engineers insert this module directly into FIO subrack slots to digitize 1 to 5 VDC and -10 to +10 VDC field transmitter inputs across 16 isolated channels. The internal converter delivers updated process data frames to the system backplane every 10 ms while providing galvanic surge protection up to 1500 VAC.

Suffix Breakdown & Model Matrix

Code Specification
AAV144 Analog Voltage Input Module Base Model
-S Standard type
0 Always 0
0 Basic type
/A4S00 Dual-redundant option with pressure clamp terminal block

Hardware Specifications

Parameter Specification
Model AAV144-S00/A4S00
Brand Yokogawa
Origin Japan
Weight 0.2 kg
Dimensions 107.5 x 130 x 32.8 mm
Operating Temp 0 to +55 deg C
Power Consumption 5.5 W (500 mA at 5 VDC backplane supply)
Channel Density 16 isolated channels
Input Signal Range 1 to 5 VDC, -10 to +10 VDC
Allowable Input Voltage ±30 VDC
Input Resistance Power ON: 1 Mohm; Power OFF: 200 kohm
Data Update Period 10 ms
Measurement Accuracy ±4 mV typical, ±20 mV maximum
Isolation Voltage 1500 VAC for 1 minute (channel-to-system)

4-20 mA HART Loop Protocol & Channel-to-Channel Isolation

The input module incorporates optical and transformer isolation to establish a 1500 VAC dielectric barrier between field loops and internal system buses. While processing voltage signals, the hardware shares internal filtering architectures with Yokogawa 4-20 mA HART loop protocol modules to suppress high-frequency line noise. Integrated temperature compensation algorithms restrict thermal drift to within ±4 mV per 10 deg C shift, maintaining measurement accuracy across varying control room ambient conditions.

Frequently Asked Questions

Q: What happens to the module input impedance when logic power is lost?

A: When system power shuts down, internal semiconductor switches shift the input impedance from 1 Mohm to 200 kohm to maintain circuit damping without overloading connected signal sources.

Q: Does the module tolerate accidental over-voltage applied to signal terminals?

A: The input channels withstand sustained fault voltages up to ±30 VDC without sustaining permanent semiconductor damage or blowing internal fuse elements.

Q: What data conversion cycle does the module maintain across all 16 channels?

A: The module executes complete analog-to-digital conversions and updates the system backplane image register every 10 ms.

Field Installation Guidelines

  1. Power down the target FIO subrack slot or verify redundant controller status prior to inserting the module into the backplane connector.
  2. Align the top and bottom card edges with the subrack guide rails and push the module straight inward until the backplane connector seats fully.
  3. Tighten the front panel retaining screws to 0.5 Nm to maintain structural stability and chassis ground connection.
  4. Strip field wiring ends to 6 mm and clamp conductors securely into the pressure clamp terminal block.
  5. Route analog signal cabling inside grounded metal conduits, maintaining a minimum physical clearance of 200 mm from high-voltage power wiring.
  6. Connect cable shield drain wires to the cabinet grounding bar at a single grounding point to eliminate ground loop currents.

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