Honeywell 900 Series Modules: 900P01-0301 & 900P01-0401 Power Supply 60W

Technical Dossier

Product Details And Specifications

Honeywell 900 Series Technical Notes

The 900P01-0301 and 900P01-0401 are 60W DC power supply modules designed to provide regulated bus power to HC900 controller racks. The 900P01-0301 operates on 100–240V AC input, while the 900P01-0401 is the 24V DC input variant — both delivering identical 60W output capacity to the rack backplane. These units are field-replaceable without rack shutdown when a redundant power supply is present.

The Evolution of 900 Series Architecture

The Honeywell 900 Series traces its lineage to the HC900 Hybrid Controller platform introduced in the early 2000s as a mid-range process controller bridging PLC-style I/O flexibility with DCS-grade process management. Early revisions (Revision A/B hardware) used a proprietary backplane bus operating at lower clock speeds with limited module counts per rack. Revision C and later hardware introduced expanded rack capacity (up to 16 I/O slots), dual-redundant controller support, and Ethernet-based peer communication replacing earlier serial links.

The power supply subsystem evolved in parallel: early 40W supplies (900P01-0101) were superseded by the 60W generation (900P01-0301 / 900P01-0401) to support higher-density I/O configurations and the increased power draw of communication modules. The 900 Series is now in a mature/end-of-active-development lifecycle phase. Honeywell continues to provide spare parts and firmware maintenance but has directed new project engineering toward the Experion PKS C300 and Safety Manager SC platforms. For existing 900 Series installations, long-term maintenance sourcing of power supplies, I/O modules, and controller cards is the primary operational concern for plant engineering teams.

900 Series Full Catalog & Functionalities (SKU List)

Power Supply Modules

• 900P01-0101: 40W AC input power supply, early-generation HC900 racks
• 900P01-0301: 60W AC input (100–240V) power supply module, standard HC900 rack
• 900P01-0401: 60W DC input (24V DC) power supply module, HC900 rack
• 900PRR-0001: Power supply redundancy relay module for dual-PSU configurations

CPU / Controller Modules

• 900C50-0143-00: HC900 C50 controller, 10/100 Ethernet, single CPU
• 900C50R-0143-00: HC900 C50 redundant controller pair module
• 900C70-0143-00: HC900 C70 controller, enhanced scan rate, dual Ethernet ports
• 900C75-0143-00: HC900 C75 controller, high-capacity function block execution
• 900RCM-0001: Redundancy communication module for C70/C75 redundant pairs

Analog Input (AI) Modules

• 900A16-0101: 16-channel analog input, 4–20mA / 0–10V, 12-bit resolution
• 900A16-0201: 16-channel analog input with HART pass-through, field device diagnostics
• 900A08-0101: 8-channel high-speed analog input, thermocouple/RTD/mV

Analog Output (AO) Modules

• 900B08-0101: 8-channel analog output, 4–20mA, loop-powered field devices
• 900B08-0201: 8-channel analog output with HART, valve positioner support

Digital Input (DI) Modules

• 900G16-0101: 16-channel 24V DC digital input, dry contact and wet contact
• 900G32-0101: 32-channel 24V DC digital input, high-density rack configuration

Digital Output (DO) Modules

• 900H16-0101: 16-channel 24V DC digital output, 0.5A per channel, solid-state
• 900H08-0101: 8-channel relay output, SPDT, 2A per channel, 250V AC rated

Communication / Network Modules

• 900CS-0001: HC900 communication server interface module, OPC DA/UA gateway
• 900MBM-0001: Modbus RTU/TCP master module, serial RS-485 and Ethernet

Quality Control for the 900 Series Range

The HC900 backplane uses a proprietary parallel bus architecture that requires module-level electrical validation beyond simple power-on testing. DriveKNMS applies the following test protocol to all 900 Series power supply and I/O modules prior to shipment:

• Backplane bus load test: Each power supply module (900P01-0301 / 900P01-0401) is loaded to 100% rated output (60W) for a minimum 4-hour burn-in period with continuous voltage and ripple monitoring.
• Input range sweep: AC input variants are tested across 90V–264V AC; DC input variants across 18V–32V DC, verifying regulation within ±1% at all input extremes.
• I/O channel functional test: All analog and digital I/O modules are tested channel-by-channel using calibrated signal sources and loads traceable to NIST standards.
• Communication module loopback test: Modbus and Ethernet communication modules undergo full protocol loopback verification at rated baud rates.
• Visual and mechanical inspection: Connector pins, backplane edge connectors, and module latches are inspected under magnification for wear, corrosion, and mechanical damage.