ASI533-S00/SS3S0

The Yokogawa ASI533-S00/SS3S0 is an eight-channel analog output module with a built-in barrier, designed to provide isolated 4-20 mA current signals to field devices. It forms part of Yokogawa's FIO analog I/O hardware range. The module uses a pressure-clamp terminal connection and supports analog control signal transmission from the control system to field equipment.

Functional Description

The ASI533 provides eight isolated analog output channels. Each channel delivers a 4-20 mA DC signal representing a control-system output value, allowing connected field devices to receive continuous control commands.

Typical signal destinations include valve positioners and other current-input actuators. The built-in barrier provides the specified electrical interface for field circuits, with isolation between the control-side and field-side circuitry.

Terminal Connection

The /SS3S0 configuration is associated with the single pressure-clamp terminal arrangement for the analog output module. Yokogawa identifies the corresponding terminal model as ATSS3S-0.

The terminal arrangement should be checked when replacing an existing module. A dual-redundant terminal configuration uses a different terminal model, ATSS3D, and should not be assumed interchangeable with the single-terminal configuration.

Technical Specifications

Parameter	Specification
Model	ASI533-S00/SS3S0
Brand	Yokogawa
Product Type	Analog Output Module with Built-In Barrier
Output Channels	8
Output Signal	4-20 mA DC
Maximum Output Current	23 mA
Allowable Load Resistance	0-750 ohm at 20 mA; 0-600 ohm at 23 mA
Output Accuracy	+/-48 uA
Step Response Time	100 ms
Data Update Period	10 ms
Withstanding Voltage	1500 V AC
Temperature Drift	+/-16 uA per 10 deg C
Maximum Current Consumption	150 mA (5 V DC); 350 mA (24 V DC)
Barrier Type	Isolated interface
HART Communication	Not supported by standard S00 version
External Connection	ATSS3S-0 pressure-clamp terminal
Operating Temperature	-20 to 70 deg C
Corrosive Gas Resistance	ISA S71.04 Class G3
Dimensions	32.8 x 107.5 x 130 mm
Weight	0.3 kg

Built-In Barrier and Isolation

The built-in barrier separates the field interface electrically from the control system. The module is specified for installation in Zone 2 or Division 2 locations and connection to suitable field devices in Zone 0, Zone 1, or Division 1 areas, subject to the applicable explosion-protection certificates and installation conditions.

The isolation specification refers to the module interface. It should not be interpreted as independent galvanic isolation between all eight output channels. The manufacturer's documentation also identifies conditions under which multiple field-channel short circuits can affect intrinsic-safety protection.

Output Performance and Load Conditions

The 4-20 mA output range supports standard industrial current-loop control. The maximum output current is 23 mA, with the allowable load resistance decreasing from 750 ohm at 20 mA to 600 ohm at 23 mA.

The 10 ms data update period describes how frequently output data is refreshed, while the 100 ms step response time describes the module's response to a change in the commanded output. These are different performance parameters and should not be treated as interchangeable.

Frequently Asked Questions

Q: Does the ASI533-S00/SS3S0 support HART communication?

A: No. The S00 version is the standard analog output configuration. Yokogawa identifies the HART-capable version with the H suffix, such as ASI533-H00.

Q: Which terminal block is specified for ASI533-S00/SS3S0?

A: The specified single pressure-clamp terminal is ATSS3S-0. The dual-redundant terminal configuration uses ATSS3D-0 and has a different ordering designation.

Q: Can the module drive a field device with a load resistance of 750 ohm?

A: Yes, at an output current of 20 mA. At the maximum output current of 23 mA, the allowable load resistance is reduced to 600 ohm. The complete field-loop resistance must remain within the applicable limit.

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