AAI543-H50/ATA4S-00

The Yokogawa AAI543-H50/ATA4S-00 is a 16-channel isolated analog output module that provides 4 to 20 mA current signals for field control devices. It supports HART digital communication and uses the ATA4S-00 pressure clamp terminal block for field wiring. Its specifications include a 10 ms data update period, circuit-open detection, and defined output isolation and load resistance limits.

Output Configuration and Signal Characteristics

The AAI543-H50 provides 16 isolated current output channels. Each channel delivers a 4 to 20 mA signal for analog control, allowing the system to transmit output commands to connected field devices.

• Output signal: 4 to 20 mA
• Number of channels: 16, isolated
• Allowable load resistance: 0 to 750 ohm
• Circuit-open detection: Less than 0.65 mA
• Accuracy: +/-48 uA
• Data update period: 10 ms

The 10 ms data update period specifies the interval at which output data is updated. Circuit-open detection provides an indication of an open output loop when the current falls below the specified threshold.

HART Communication and Terminal Connection

The HART-capable configuration supports digital communication over the analog current loop. This allows compatible field instruments to exchange digital information while using the 4 to 20 mA signal for the primary analog output.

The specified ATA4S-00 pressure clamp terminal block provides the field wiring interface. The listed external connection options also include a MIL connector cable and dedicated KS1 cable. The appropriate connection arrangement depends on the installed terminal and cable configuration.

Redundant Configuration and Switch-over Response

The H50 configuration identifies the standard switch-over response type for redundant operation without explosion protection. In a dual-redundant arrangement, two identical AAI543 modules with the same switch-over response type are used as control and standby modules.

During a control-to-standby switchover, the output may fall below 4 mA for a maximum of 100 ms. This timing is relevant when selecting the module for field devices that require continuous current output. The fast-response version has a different ordering code and should not be treated as equivalent to this standard-response configuration.

Technical Specifications

Parameter	Specification
Model	AAI543-H50/ATA4S-00
Brand	Yokogawa
Product Type	Analog Output Module
Number of Output Channels	16, isolated
Output Signal	4 to 20 mA
HART Communication	Available
Withstanding Voltage	1500 V AC, 1 minute (output to system)
Allowable Load Resistance	0 to 750 ohm
Circuit-Open Detection	Less than 0.65 mA
Output Accuracy	+/-48 uA
Data Update Period	10 ms
Ambient Temperature Drift	+/-16 uA/10 deg C
Maximum Current Consumption	230 mA (5 V DC), 540 mA (24 V DC)
External Connection	Pressure clamp terminal, MIL connector cable, dedicated KS1 cable
Terminal Block	ATA4S-00
Weight	0.4 kg

Electrical Isolation and Load Requirements

The module provides 1500 V AC withstand voltage between the output circuit and the system for one minute. This specification defines the isolation withstand capability between these two sides; it should not be interpreted as a channel-to-channel isolation rating.

The allowable load resistance is 0 to 750 ohm. When connecting a field device, the total loop resistance, including wiring and connected equipment, must remain within the specified output load range.

Frequently Asked Questions

Q: Does the AAI543-H50/ATA4S-00 support HART communication?

A: Yes. The H suffix identifies the HART digital communication version. It supports HART communication alongside the 4 to 20 mA analog output.

Q: What is the difference between standard and fast switch-over versions?

A: The H50 configuration uses standard switch-over response, with a maximum output drop-below-4 mA period of 100 ms during redundant switchover. The fast-response configuration uses a different suffix code and has a maximum period of 2 ms.

Q: Which terminal block is specified for this configuration?

A: The specified terminal block is ATA4S-00, a pressure clamp terminal block. The corresponding Yokogawa option code is /A4S00. Verify the terminal block and cable arrangement against the installed FIO hardware before replacement.

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