Description

Technical Specifications

Parameter	Value
Product Model	900C32-0021
Manufacturer	Honeywell
Product Type	32-Channel Digital Input Module
System Platform	Honeywell HC900 Hybrid Controller
Input Channels	32 points
Input Type	24 VDC, sinking (NPN) compatible
Logic “1” Voltage	15 to 30 VDC
Logic “0” Voltage	-3 to +5 VDC
Input Current	Approx. 3 mA @ 24 VDC
Isolation	Group isolated (typically 8 points per group), 500V AC
Filter Time	Software configurable (1 ms to 100 ms)
Power Supply	Powered via HC900 backplane
Operating Temperature	0°C to +60°C
Storage Temperature	-40°C to +85°C
Protection Rating	IP20
Mounting	HC900 controller rack or remote I/O station
Status Indication	Per-channel green LED indicators

Main Features and Advantages

High-Density 32-Channel Design: The Honeywell 900C32-0021 provides 32 discrete input points in a single module, significantly reducing the number of modules required for large-scale digital signal acquisition. This high-density design translates directly into reduced cabinet footprint, lower hardware costs, and simplified system architecture.

Flexible Input Compatibility: The Honeywell 900C32-0021 supports both dry contact (volt-free) and wet contact (24VDC sourcing) inputs, accommodating a wide variety of field devices. This versatility simplifies field wiring and reduces the need for external interface components.

Group Isolation for Noise Immunity: With channels arranged in groups of 8 sharing a common return path, the Honeywell 900C32-0021 provides effective electrical isolation between signal groups. This design prevents ground loop issues and protects the controller from field-side electrical noise and transients commonly encountered in industrial environments.

Software-Configurable Filtering: The Honeywell 900C32-0021 allows input filter time to be configured via HC900 Designer software, enabling optimization for specific applications. Shorter filter times suit high-speed signals, while longer filters reject contact bounce and electrical noise in harsh environments.

Hot-Swappable Design: The Honeywell 900C32-0021 supports hot insertion and removal, enabling module replacement without powering down the HC900 controller. This feature minimizes downtime during maintenance, system expansion, or module upgrades, a critical advantage in continuous process applications.

Clear Status Indication: Each input channel features a green LED that displays the current signal state, simplifying troubleshooting and system verification at a glance.