900B01-0301 Honeywell Isolated Current Output Module

Honeywell 900B01-0301 Analog Output Module

The 900B01-0301 is a reliable 4-channel Analog Output module for the Honeywell HC900 controller. It provides isolated current outputs for precise control of actuators, valves, and other field devices.

Core Technical Specifications

• Brand: Honeywell
• Model Number: 900B01-0301
• Product Type: Analog Output (AO) Module
• Outputs per Module: 4 Channels (Individually Isolated)
• Output Type: Current Sink
• Output Range: 0 to 21.8 mA (User-scalable per channel)
• D/A Resolution: 12 Bits
• Load Resistance: 750 Ohms Maximum
• Galvanic Isolation (Channel-to-Channel): 500 VDC
• Galvanic Isolation (to Logic): 600 VDC
• Accuracy (Reference Conditions): 0.1% of Full Scale
• Minimum Current Sensing: > 3.5 mA per output
• Update Rate (IOM Scan): Minimum 500 ms
• Modules per Rack: 10 Maximum (Up to 12 with Ambient Temperature Derating)
• Fail-Safe Modes: Hold Last Value, User-Defined Failsafe Value
• Slew Rate Control: User-configurable maximum rate of change (mA per execution cycle)
• Output Verification: Feedback to controller confirms actual output current
• Calibration Data Storage: Non-Volatile Memory with Redundant Factory Calibration
• Diagnostics: Monitors Factory Calibration, Configuration, and +24 VDC Power Supply
• Status Indicator: Green Blinking LED (Active Scan), Red LED (Fault/Diagnostic)
• Operating Temperature: 0°C to +60°C (Standard HC900 Range)
• Power Supply: 24V DC from Backplane

Module Features & Control

• Four fully isolated output channels prevent interference between connected field devices.
• Wide output range (0-21.8mA) supports standard 0-20mA and 4-20mA signaling with overhead.
• Configurable failsafe operation ensures predictable system behavior during communication loss.
• Integrated output current verification provides closed-loop confirmation of commanded output.
• Slew rate control allows limitation of output change speed to protect sensitive actuators.
• Redundant factory calibration stored in non-volatile memory ensures long-term accuracy and reliability.
• Diagnostics continuously monitor module health, flagging calibration or power supply issues.

Installation & Configuration

• Install in a compatible Honeywell HC900 rack (e.g., 900R04-0300).
• Do not exceed the maximum load resistance of 750 ohms per channel to ensure proper current output.
• Use appropriate cable gauges for the required loop current and distance.
• Configure each channel's output range (e.g., 4-20mA) and failsafe value via HC900 software.
• Set the slew rate parameter to match the response time of the connected final control element.
• Verify output current with a calibrated milliammeter during commissioning.

Typical Applications

• Controlling control valve positioners (4-20mA).
• Driving variable frequency drive (VFD) speed references.
• Providing setpoints to secondary controllers or recorders.
• Operating I/P (current-to-pressure) transducers.

For integration support or to order the Honeywell 900B01-0301, contact our engineering sales team.

Contact: Email sales@nex-auto.com or WhatsApp +86 153 9242 9628.

Partner: NexAuto Technology Limited

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