SAI143-H63/A4S00

The Yokogawa SAI143-H63/A4S00 is a 16-channel analog input module for 4-20 mA current signals, with module-level isolation and HART communication capability. It is designed to acquire field instrument signals for processing by a compatible control system. The specified /A4S00 option identifies a pressure clamp terminal block, model STA4S-00. However, the combination of this terminal-block option with the -H63 interface configuration requires verification before ordering.

Technical Specifications

Parameter	Specification
Model	SAI143-H63/A4S00
Brand	Yokogawa
Product Type	Analog Input Module
Base Model	SAI143
Input Channels	16
Rated Input Range	4 to 20 mA
Permissible Input Range	0 to 25 mA
Rated Accuracy	+/-16 uA for SAI143-H, subject to applicable style-code conditions
Data Update Frequency	40 ms
Temperature Drift	+/-16 uA/10 deg C
Input Impedance During Power-On	250 ohm plus current-dependent voltage drop across the input protection circuit
Input Impedance During Power-Off	500 kohm minimum
Transmitter Power Supply	16.15 V minimum at 20 mA; 26.4 V maximum at 0 mA
Transmitter Output Current Limit	25 mA
2-Wire/4-Wire Configuration	Individually selectable by setting pins
Transmitter Power Supply ON/OFF	Available for all 16 channels simultaneously in 2-wire mode, subject to hardware and system-version requirements
HART Communication	Supported
PRM Support	Available for SAI143-H
Withstand Voltage	1.5 kV AC between input signal and system for 1 minute; 500 V AC when using a dedicated signal cable
Maximum Current Consumption	5 V system: 320 mA; 24 V system: 550 mA
Weight	0.34 kg
Operating Temperature	-20 to 70 deg C
Terminal Block Option	/A4S00: STA4S-00, pressure clamp terminal block for analog signals

Specifications are based on Yokogawa General Specifications GS 32Q06K30-31E.

Signal Acquisition and HART Communication

The SAI143 converts field current signals into input data for the control system. Its 40 ms update frequency defines the nominal data refresh interval, while the rated accuracy and temperature drift describe measurement error under the manufacturer's specified conditions. These parameters should be considered when configuring process scaling, alarm thresholds, and measurement tolerances.

The -H designation identifies the HART communication version. HART support allows compatible field devices to exchange digital device information over the analog current loop, in addition to providing the 4-20 mA process measurement. Yokogawa lists Plant Resource Manager (PRM) support for the SAI143-H variant.

Transmitter Power and Wiring

The module supports individual 2-wire or 4-wire configuration by channel using setting pins. In 2-wire applications, the module's transmitter power supply provides operating power to compatible loop-powered instruments. Its specified voltage and current limit should be checked against the field transmitter's supply requirements and loop voltage budget.

The transmitter power supply ON/OFF function operates across all 16 channels simultaneously when configured for 2-wire operation; it is not an independently controlled power switch for each channel. The manufacturer describes this function as supporting alarm-state reset for Fire and Gas devices, subject to the required hardware style and system software version.

Ordering Configuration and Connection Requirements

The supplied order number contains a configuration inconsistency that should be resolved before purchase.

• SAI143: 16-channel, 4-20 mA analog input module with module isolation.
• -H: HART communication version.
• 6: Signal cable interface adapter configuration without explosion protection.
• 3: ISA G3 and temperature-related suffix.
• /A4S00: Pressure clamp terminal block, model STA4S-00.

Yokogawa's ordering documentation indicates that the -6 interface configuration cannot be combined with the pressure clamp terminal block option. Therefore, SAI143-H63/A4S00 should not be treated as a verified compatible factory configuration until the ordering code is confirmed.

Frequently Asked Questions

Q: Is the SAI143-H63 an analog input or digital output module?

A: It is an analog input module for 4-20 mA current signals. The digital output classification appearing in some supplied product listings is inconsistent with Yokogawa's official hardware specifications.

Q: Does the SAI143-H63 support HART instruments?

A: Yes. The -H variant supports HART communication. Confirm compatibility with the installed control-system hardware and software revisions before commissioning.

Q: Can the SAI143-H63 be ordered with the STA4S-00 pressure clamp terminal block?

A: The documented -6 suffix specifies a signal cable interface adapter, whereas /A4S00 specifies the STA4S-00 pressure clamp terminal block. The combination requires correction or manufacturer confirmation before ordering.

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