Honeywell HC900 C50 Modules: 900C50-0460

Technical Dossier

Product Details And Specifications

Honeywell HC900 C50 Series Technical Notes

The Evolution of HC900 Architecture

The HC900 platform was introduced by Honeywell as a successor to earlier hybrid controller families, consolidating analog loop control and discrete logic into a single rack-mounted system communicating over a proprietary C-Bus backplane. Early revisions of the C50 CPU operated at lower scan rates and supported limited rack expansion; subsequent firmware revisions extended loop counts, improved Ethernet supervisory connectivity, and added OPC-DA/UA compatibility for integration with Honeywell Experion PKS and third-party SCADA systems.

HC900 Full Catalog & Functionalities (SKU List)

CPU / Controller Modules

• 900C50-0460: C50 CPU module, 50-loop capacity, Ethernet supervisory port, C-Bus backplane master
• 900C30-0460: C30 CPU module, 30-loop capacity, entry-tier process controller for smaller unit operations
• 900C70-0460: C70 CPU module, 70-loop capacity, maximum expansion support, dual-rack master capability
• 900C50-0001: C50 CPU replacement unit, earlier hardware revision, compatible with legacy rack assemblies

Analog Input (AI) Modules

• 900G32-0001: 16-channel analog input module, 4–20 mA / 1–5 V, high-density process measurement
• 900G16-0001: 8-channel analog input module, thermocouple/RTD universal input, cold-junction compensated
• 900G08-0001: 4-channel analog input module, high-accuracy differential measurement, HART pass-through capable

Analog Output (AO) Modules

• 900H32-0001: 8-channel analog output module, 4–20 mA sourcing, loop-powered field device compatible
• 900H08-0001: 4-channel analog output module, isolated outputs, suitable for valve positioner drive

Digital Input (DI) Modules

• 900G04-0001: 32-channel digital input module, 24 VDC, high-density discrete status monitoring
• 900G04-0002: 32-channel digital input module, 120 VAC, field-level voltage compatibility

Digital Output (DO) Modules

• 900H04-0001: 16-channel digital output module, 24 VDC sourcing, relay-equivalent switching
• 900H04-0002: 16-channel digital output module, relay contact outputs, dry-contact field wiring

Communication / Network Modules

• 900RTC-0001: Remote I/O rack controller, C-Bus expansion master for satellite rack configurations
• 900MIO-0001: Modbus TCP/RTU communication module, third-party system integration gateway

Power Supply Modules

• 900P01-0001: HC900 rack power supply, 24 VDC output, primary rack power for CPU and I/O modules
• 900P02-0001: Redundant power supply module, hot-swap capable, N+1 power architecture support

Quality Control for the HC900 Range

HC900 modules present specific test challenges due to the C-Bus backplane communication protocol and the tight coupling between CPU firmware and I/O module hardware revisions. DriveKNMS applies a structured test protocol to all HC900 units prior to shipment:

• Backplane continuity and bus termination resistance verification on all rack connector pins
• CPU module boot sequence validation with firmware version logging
• I/O channel functional test: each analog channel is exercised across the full 4–20 mA / 0–10 V range with calibration verification against NIST-traceable references
• Digital I/O switching test: all discrete channels verified for correct state transition and leakage current within specification
• Communication port test: Ethernet supervisory port and C-Bus expansion port loopback verification
• Thermal soak: modules operated at rated temperature for minimum 4 hours prior to final inspection
• Cosmetic and connector inspection: backplane connector pin straightness, PCB visual inspection for corrosion or component damage