Yokogawa AAI841-S00 Analog I/O Module

Hardware Specifications

4-20 mA Loop Interface and HART Configuration

The AAI841 module combines analog signal acquisition and output generation in one module. Its eight input channels receive 4-20 mA signals, while its eight output channels provide corresponding analog control interfaces. The specified standard type is non-isolated, so system designers must evaluate grounding, common-mode voltage, and external loop isolation requirements against the applicable hardware manual.

The -H suffix identifies the variant with HART digital communication. Do not assume HART functionality on the -S standard type. Confirm the complete module suffix and option codes before wiring field devices.

Frequently Asked Questions

Q: How many analog channels does the AAI841 provide?

A: The module provides 8 analog input channels and 8 analog output channels. Both interfaces use 4-20 mA signals according to the supplied specifications.

Q: Does the AAI841-S00 support HART communication?

A: The supplied suffix table identifies -H as the HART-enabled type and -S as the standard type. Confirm the complete order code before connecting HART field instruments.

Q: What power and output load requirements should be checked?

A: The supplied data lists maximum current consumption of 310 mA at 5 VDC and 500 mA at 24 VDC. The specified output load resistance is 0 to 750 ohm. Verify the applicable system power budget and field loop load before commissioning.

Field Installation Guidelines

• Verify the complete model code, suffix codes, and option codes against the installed system documentation before mounting the module.
• Confirm the compatible base unit, rack position, terminal assembly, and cable interface using the applicable Yokogawa hardware manual.
• Check the field transmitter and actuator wiring against the assigned input and output channels.
• Route analog signal wiring separately from high-voltage power cables and sources of electrical interference where practicable.
• Apply shield termination and grounding according to the system grounding design and the manufacturer’s installation instructions.
• Because the specified module configuration is non-isolated, assess loop grounding and potential differences before connecting externally powered instruments.
• Confirm the supply voltage, current budget, output load resistance, and polarity before energizing the circuit.
• For HART applications, verify that the installed module variant supports HART communication and that the field loop meets the requirements of the selected instruments.
• Do not assume hot-swap capability, redundant operation, or explosion-protection approval without checking the exact hardware revision and configuration documentation.