Honeywell 900G04-0101 Digital Input Module

Technical Dossier

Product Details And Specifications

Honeywell HC900 Series Technical Notes

The Evolution of HC900 Architecture

The HC900 platform was introduced by Honeywell as a mid-range hybrid controller bridging the gap between standalone PLCs and full DCS installations. Early generations used the C30, C50, and C70 CPU modules with limited I/O slot counts and RS-485-based peer communication. The architecture evolved through successive firmware generations to support Ethernet-based supervisory communication, redundant CPU configurations (C75R), and expanded rack sizes supporting up to 16 I/O slots per chassis. The introduction of the 900 series I/O modules standardized the backplane bus interface, enabling hot-swap capability on select module types. Compatibility between early-generation racks and later I/O modules requires firmware version verification; modules manufactured after 2010 may require controller firmware v4.x or higher for full feature support. The platform is currently in a mature/sustaining lifecycle phase — Honeywell continues to supply replacement modules and firmware updates, but no new architectural generations are planned. Long-term maintenance support is the primary use case for sourcing HC900 components today.

HC900 Full Catalog & Functionalities (SKU List)

The following SKUs represent the core HC900 module range, organized by functional category. All models listed are verified HC900-compatible components.

Digital Input (DI) Modules

• 900G04-0101: 120 VAC digital input module, 16-channel, isolated, rack-mount
• 900G32-0101: 24 VDC digital input module, 32-channel, high-density I/O
• 900G16-0101: 24 VDC digital input module, 16-channel, standard density

Digital Output (DO) Modules

• 900H16-0101: 24 VDC digital output module, 16-channel, sourcing type
• 900H32-0101: 24 VDC digital output module, 32-channel, high-density
• 900H08-0101: Relay output module, 8-channel, SPDT contacts, 2A per channel

Analog Input (AI) Modules

• 900A16-0101: Analog input module, 16-channel, 4–20 mA / 1–5 V, 12-bit resolution
• 900A08-0101: Analog input module, 8-channel, thermocouple/RTD/mV universal input
• 900A16H-0101: High-speed analog input module, 16-channel, 4–20 mA

Analog Output (AO) Modules

• 900B08-0101: Analog output module, 8-channel, 4–20 mA, 12-bit resolution
• 900B16-0101: Analog output module, 16-channel, 4–20 mA, loop-powered

CPU / Controller Modules

• 900C30-0143-00: HC900 C30 controller, 30 I/O slots, single Ethernet port
• 900C50-0143-00: HC900 C50 controller, 50 I/O slots, dual Ethernet
• 900C70-0143-00: HC900 C70 controller, 70 I/O slots, expanded memory
• 900C75-0143-00: HC900 C75 redundant controller module, primary unit

Communication & Network Modules

• 900RTC-0001: Remote terminal controller, Modbus RTU/TCP gateway module
• 900EIM-0001: Ethernet interface module, 10/100 Mbps, OPC-DA compatible

Power Supply Modules

• 900P01-0001: HC900 rack power supply, 24 VDC output, 40W capacity
• 900P02-0001: Redundant power supply module, hot-swap capable