Honeywell 900A01-0002 Analog Input Module

Configured for analog signal acquisition in Honeywell ControlEdge HC900 control systems, the Honeywell 900A01-0002 (900A01 Analog Input Module) provides direct electrical measurement of voltage, current, and slidewire feedback signals. The module converts field analog signals into digital process values for closed-loop control, position feedback monitoring, and process variable acquisition within HC900 controller architectures.

Hardware Specifications

Channel-to-Channel Isolation and Analog Signal Acquisition

The 900A01-0002 provides eight independent analog input channels for monitoring process instrumentation and actuator feedback devices. Supported signal types include voltage signals, current loops, and slidewire position feedback devices commonly used with motor-operated actuators and positioning systems.

The module incorporates 1500 V isolation between field-side circuits and backplane logic electronics. This isolation assists in limiting the influence of ground potential differences and electrical disturbances originating from field wiring networks.

Input channel processing is performed through 16-bit analog-to-digital conversion hardware, providing high-resolution acquisition of process measurements and feedback signals.

Slidewire Feedback and Process Signal Integration

The module is designed to support both conventional process instrumentation and position feedback applications. Slidewire input support allows direct acquisition of potentiometric feedback signals from actuator position transmitters and valve positioning devices.

Supported analog interfaces include:

• 4 mA to 20 mA current loops

• 0 V to 5 V voltage signals

• 1 V to 5 V voltage signals

• 0 V to 10 V voltage signals

• 100 Ohm to 250 Ohm slidewire inputs

• 250 Ohm to 1000 Ohm slidewire inputs

The HC900 controller processes acquired data for monitoring, alarming, control calculations, and historical data collection functions.

Frequently Asked Questions

Q: How many analog input channels are available on the module?
A: The 900A01-0002 provides eight independent analog input channels.

Q: Does the module support both current and voltage signal inputs?
A: Yes. The module supports 4 mA to 20 mA current inputs together with multiple DC voltage input ranges.

Q: Is electrical isolation provided between field wiring and the controller backplane?
A: Yes. The module provides 1500 V isolation between the field side and logic side electronics.

Field Installation Guidelines

• Verify compatibility with the installed HC900 controller chassis before installation.

• Configure the appropriate input type for each channel before commissioning.

• Route analog signal wiring separately from motor power and high-current conductors.

• Use shielded instrumentation cable where required by plant engineering standards.

• Confirm slidewire resistance ranges match the configured channel requirements.

• Verify field polarity and grounding arrangements before energizing the module.

• Perform input scaling checks and signal validation after installation.