YOKOGAWA AAI835-H53/K4A00 Analog I/O Module

The YOKOGAWA AAI835-H53/K4A00 is a 4-channel isolated analog input/output module that handles 4-20 mA signals and supports HART digital communication. It provides four input channels and four output channels, with electrical isolation between channels and between the I/O circuits and the system. Furthermore, the /K4A00 configuration includes an ATK4A-00 KS bus interface adapter for the specified connection arrangement.

Key Features

• Supports four analog input channels and four analog output channels.
• Handles 4-20 mA signals for analog measurement and control.
• Supports HART protocol for digital communication with compatible field instruments.
• Provides galvanic isolation between individual channels and between the channels and the system.
• Includes the ATK4A-00 KS bus interface adapter under the /K4A00 option.
• Supports the ISA S71.04 G3 environmental severity level.
• Meets EN 60079-15:2010 requirements for non-incendive equipment in Zone 2 hazardous areas, with Na protection level.

Analog I/O Function

The AAI835 handles analog input and output signals within the control system. Input channels receive 4-20 mA signals from field instruments, while output channels transmit 4-20 mA control signals to compatible field devices. Meanwhile, HART communication allows digital instrument information to travel alongside the analog current signal.

The module provides channel isolation to separate signal circuits electrically. This arrangement helps limit the effects of electrical interference and potential differences between connected circuits.

Technical Specifications

Ordering Configuration

The full model number identifies the communication, environmental and connection options. The following configuration details distinguish the AAI835-H53/K4A00 from other ordering variants.

Note: The /K4A00 suffix identifies the ATK4A-00 adapter configuration. Other available terminal and interface options include ATB3A-00, ATIS3-00, ATIS3-10, ATID3-00 and ATID3-10. These are alternative ordering configurations and should not be assumed to be included with this model.

Frequently Asked Questions

Q: Does the AAI835-H53/K4A00 support HART communication?

A: Yes. The H suffix identifies the HART communication option. The module supports digital communication with compatible HART field instruments alongside 4-20 mA analog signals.

Q: Which KS bus adapter is included with this model?

A: The /K4A00 suffix specifies the ATK4A-00 KS bus interface adapter. Other adapter or terminal configurations require their respective ordering codes.

Q: Can the AAI835-H53/K4A00 be used in Zone 2 hazardous areas?

A: The supplied specifications state compliance with EN 60079-15:2010 for non-incendive equipment in Zone 2, with Na protection level. However, the ordering code identifies the 5 option as having no explosion protection. Confirm the exact certification and nameplate marking before selecting this model for a hazardous-area installation.