AAI543-H00/A4S00

The Yokogawa AAI543-H00/A4S00 is a 16-channel analog output module designed to provide isolated 4-20 mA current signals to field devices. It supports HART digital communication and uses the /A4S00 option, which specifies a pressure-clamp terminal block (ATA4S-00) for field signal connections. The module converts control-system output values into analog current signals for connected instruments and control equipment.

Output Function and Signal Configuration

The AAI543 provides 16 analog output channels with a 4-20 mA DC signal range. Each channel supplies a current output corresponding to the control-system command, allowing the module to interface with devices such as control valve positioners and other current-operated field equipment.

The isolated-channel configuration separates the output circuits from the system side. This helps limit the propagation of electrical disturbances between field wiring and the control-system electronics. HART communication adds digital data exchange over the analog current loop, where supported by the connected field instrument and system configuration.

Terminal Block and Field Wiring

The /A4S00 option identifies the pressure-clamp terminal block ATA4S-00. This provides the physical termination interface for analog field wiring, rather than a separate output signal type. The terminal configuration should be checked against the installed module and cabinet wiring arrangement when replacing an existing unit.

Output Performance and Load Requirements

The published AAI543 hardware specifications provide an allowable load resistance of 0 to 750 ohms, an output accuracy of +/-48 uA, and a data update period of 10 ms. These values are relevant when checking the connected actuator or positioner's input impedance and the response requirements of the control loop.

Dual-Redundant Operation

The H00 configuration specifies the standard switch-over response for redundant operation. When two identical AAI543 modules are configured as a redundant pair, the maximum period during which the field output falls below 4 mA during a control-to-standby switchover is 100 ms. This response characteristic should be considered when the connected field device has specific signal interruption requirements.

Technical Specifications

Parameter	Specification
Model	AAI543-H00/A4S00
Brand	Yokogawa
Product Type	Analog Output Module
Number of Output Channels	16
Output Signal	4-20 mA DC
Output Isolation	Isolated between output and system
Withstanding Voltage	1500 V AC for 1 minute
Allowable Load Resistance	0 to 750 ohms
Circuit-Open Detection	Less than 0.65 mA
Output Accuracy	+/-48 uA
Data Update Period	10 ms
Temperature Drift	+/-16 uA/10 deg C
HART Communication	Available
Redundant Operation	Dual-redundant configuration
Switch-over Response	Standard, maximum 100 ms below 4 mA
Maximum Current Consumption	230 mA (5 V DC), 540 mA (24 V DC)
Weight	Approx. 0.40 kg
Terminal Block Option	/A4S00
Associated Terminal Block	ATA4S-00

Suffix and Ordering Code Identification

The ordering code identifies the communication function, redundancy response and terminal connection configuration:

Code	Description
AAI543	4-20 mA, 16-channel isolated analog output module
-H	Digital communication with HART protocol
0	Standard switch-over response in redundant configuration
0	Basic type
/A4S00	Pressure Clamp Terminal Block
ATA4S-00	Associated terminal block model

The H00 configuration is the standard-response basic type. It should not be confused with the fast-response H10 configuration or the G3 and extended-temperature variants.

Frequently Asked Questions

Q: Does the AAI543-H00/A4S00 support HART communication?

A: Yes. The H suffix identifies the HART communication function. Digital communication allows supported field instruments to exchange additional device information alongside the 4-20 mA analog signal.

Q: Can this module operate in a dual-redundant configuration?

A: Yes. The H00 version uses the standard switch-over response. Two identical modules are required for dual-redundant operation, with a maximum output interruption below 4 mA of 100 ms during switchover.

Q: What does the /A4S00 option provide?

A: It specifies the ATA4S-00 pressure-clamp terminal block for analog signal connections. It is a terminal connection option, not a change to the module's 4-20 mA output function.

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