AAI143-H03/K4A00

The Yokogawa AAI143-H03/K4A00 is a 16-channel isolated analog input module designed to receive 4 to 20 mA signals from field instruments. It supports HART digital communication and provides a 10 ms data update period. The H03 configuration includes the ISA Standard G3 and -20 to 70 deg C options, while the K4A00 configuration uses a KS Cable Interface Adapter for connection to an AEA4D Terminal Board.

Key Specifications

Parameter	Specification
Model	AAI143-H03/K4A00
Brand	Yokogawa
Product Type	Analog Input Module
Input Channels	16, isolated
Input Signal	4 to 20 mA
Communication Protocol	HART
Allowable Input Current	24 mA
Withstanding Voltage	1500 V AC, 1 minute, between input and system
Input Resistance (Power ON)	270 ohm (at 20 mA) to 350 ohm (at 4 mA)
Input Resistance (Power OFF)	500 kohm or larger
Accuracy	+/-16 uA
Data Update Period	10 ms
Environmental Option	ISA Standard G3; -20 to 70 deg C
Cable Interface	KS Cable Interface Adapter
Compatible Terminal Board	AEA4D
Adapter Model	ATK4A-00
Weight	0.3 kg

Input Channels and HART Communication

The module provides 16 electrically isolated input channels for 4 to 20 mA field signals. Each channel acquires an analog current value for processing by the control system. The isolation between the input side and system side is specified at 1500 V AC for one minute.

HART support allows digital communication over the analog current loop. This provides access to supported field-device information in addition to the primary process variable represented by the 4 to 20 mA signal. Actual HART communication functions depend on the field device and system configuration.

Signal Isolation and Electrical Characteristics

The 1500 V AC withstand rating applies between the input and system sides for a test duration of one minute. This specification defines the isolation withstand capability and should not be interpreted as a channel-to-channel isolation rating.

The input resistance varies with operating state. During normal operation, it ranges from 270 ohm at 20 mA to 350 ohm at 4 mA. When module power is off, the input resistance is at least 500 kohm. The allowable input current is 24 mA, providing a defined upper limit for the input signal.

Ordering Configuration

The complete ordering number identifies the module's communication, environmental and connection configuration.

Code	Description
AAI143	16-channel isolated analog input module
-H	HART digital communication
0	Basic type code
3	ISA Standard G3 and -20 to 70 deg C temperature options
/K4A00	KS Cable Interface Adapter for AEA4D Terminal Board
ATK4A-00	Adapter model associated with /K4A00

The /K4A00 option specifies the cable interface arrangement rather than an additional input channel or signal-processing function. When checking replacement parts, retain the complete suffix and option code to ensure the terminal connection configuration matches the installed assembly.

Frequently Asked Questions

Q: Does the AAI143-H03/K4A00 support HART communication?

A: Yes. The -H suffix specifies HART digital communication alongside the 4 to 20 mA analog input signal. HART communication also depends on compatible field instruments and the supporting control-system configuration.

Q: Which terminal board is specified for the AAI143-H03/K4A00?

A: The /K4A00 option specifies the ATK4A-00 KS Cable Interface Adapter for connection to an AEA4D Terminal Board. This connection configuration should be retained when selecting a replacement module.

Q: What is the specified operating temperature range?

A: The suffix code 3 specifies the ISA Standard G3 option and the -20 to 70 deg C temperature option. This is the specified environmental configuration for the ordered module.

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