AAI143-H50/A4S00

The Yokogawa AAI143-H50/A4S00 is a 16-channel isolated analog input module designed to receive 4-20 mA signals from field transmitters. It supports HART digital communication in addition to analog signal acquisition. The /A4S00 option specifies a pressure clamp terminal block (ATA4S-00), providing the field wiring interface for the module.

Functional Description

The AAI143-H50 converts field current signals into digital process data for use by the control system. Its 16 input channels are electrically isolated, helping separate field signal circuits from the system side and reducing the effects of electrical interference between connected measurement loops.

The HART-enabled configuration supports access to digital field-device information alongside the conventional 4-20 mA measurement. This allows compatible field instruments to provide additional variables through HART communication, subject to the control system's HART communication package and firmware requirements.

Input and Transmitter Characteristics

Each channel accepts a 4-20 mA DC signal, with an allowable input current of 24 mA. The module supports both 2-wire and 4-wire transmitters, selected individually for each channel using the module setting pins.

For 2-wire transmitters, the module provides a loop supply of at least 19.0 V at 20 mA, with a maximum of 25.5 V at 0 mA and a 25 mA output current limit. External wiring voltage drop must be considered when checking the transmitter's minimum operating voltage.

HART Communication

The -H suffix identifies the HART digital communication version. HART communication allows compatible field instruments to exchange digital device information over the same 4-20 mA signal loop used for process measurement.

When installed in an ER bus node unit with HART functionality, the EB401 firmware must be Revision 2 or later. The availability of HART data also depends on the installed system communication configuration.

Terminal Block and Redundancy

The /A4S00 option specifies the ATA4S-00 pressure clamp terminal block for field signal wiring. This is different from /A4S10, which specifies a pressure clamp terminal block with a surge absorber.

The AAI143 supports dual-redundant configuration. Redundancy requires an appropriate system arrangement and compatible module configuration; the presence of a single AAI143-H50/A4S00 does not itself provide redundancy.

Technical Specifications

Parameter	Specification
Model	AAI143-H50/A4S00
Brand	Yokogawa
Product Type	Analog Input Module
Base Model	AAI143
Number of Input Channels	16
Channel Isolation	Isolated
Input Signal	4-20 mA DC
Allowable Input Current	24 mA
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
Withstanding Voltage	1500 V AC for 1 minute (input to system, subject to cable conditions)
Transmitter Power Supply	19.0 V or higher at 20 mA; 25.5 V or less at 0 mA
Transmitter Supply Current Limit	25 mA
Transmitter Configuration	2-wire or 4-wire, selected per channel
Temperature Drift	+/-16 uA/10 deg C
Maximum Current Consumption	230 mA (5 V DC); 540 mA (24 V DC)
HART Communication	Supported
Terminal Block	ATA4S-00
External Connection	Pressure clamp terminal
Redundant Configuration	Supported
Dimensions (W x H x D)	107.5 x 32.8 x 130 mm
Weight	0.3 kg

Model Configuration

The ordering code identifies the module's signal-processing and terminal connection configuration:

Code	Description
AAI143	16-channel, 4-20 mA isolated analog input module
-H	HART digital communication
5	Without explosion protection
0	Basic type
/A4S00	Pressure clamp terminal block, model ATA4S-00

The complete ordering number specifies a HART-enabled, non-explosion-protected basic module with the ATA4S-00 terminal block. Do not confuse this configuration with the /A4S10 surge-absorber version or the /A4D00 dual pressure clamp terminal block version.

Frequently Asked Questions

Q: Does the AAI143-H50/A4S00 support HART communication?

A: Yes. The -H suffix identifies the HART communication version. It supports digital communication with compatible HART field devices in addition to 4-20 mA analog signal acquisition. System firmware and communication configuration must also meet the applicable requirements.

Q: What terminal block is supplied with the AAI143-H50/A4S00?

A: The /A4S00 option specifies the ATA4S-00 pressure clamp terminal block. It provides the field wiring interface for the module. The ATA4S-10 version includes a surge absorber and is a different ordering option.

Q: Can this module operate in a redundant configuration?

A: Yes. The AAI143 supports dual-redundant configuration. The control system must provide the corresponding redundant hardware arrangement and satisfy the applicable installation requirements.

---