Honeywell HC900 900C73R-0100-44 Redundant I/O Scanner

Overview

HONEYWELL HC900 · REDUNDANT REMOTE I/O

900C73R-0100-44 Redundant I/O Scanner

Dual-port remote I/O scanner for communication between an HC900 redundant controller pair and a remote I/O rack.

At a Glance

Brand	Honeywell
Model	900C73R-0100-44
Product Type	Redundant remote I/O scanner
Core Function	Transfers remote I/O data to a redundant controller pair
Application / Compatible Series	Honeywell HC900 redundant controller systems

Exact Identification
Match the complete catalog number and hardware revision.

Dual Controller Links
Confirm both CPU-side network paths.

Rack Addressing
Record the installed scanner address before replacement.

Product Overview

Honeywell 900C73R-0100-44 is an HC900 remote I/O scanner for redundant-controller installations. It provides one network connection for each controller side so remote-rack input data can be delivered to the lead controller and output data returned to the appropriate I/O modules.

Scanner data exchange is synchronized with the controller scan, while module diagnostic status is monitored and reported to the controller. Address settings and both network paths should be documented before a replacement is fitted.

Verify the full catalog number, remote-rack address, controller redundancy arrangement and both communication cables before installation.

Key Functions

Redundant Remote-I/O Communication

Maintains separate communication paths to the two controllers in an HC900 redundant pair.

Deterministic Data Exchange

Exchanges remote input and output data in step with the controller scan.

Rack Diagnostics

Monitors remote I/O module status and reports detected diagnostic conditions.

Official Specifications

Controller Connections	2 Ethernet paths, one for each redundant CPU
Communication Medium	10/100Base-T Ethernet
Module Supply	5 V DC from the rack
Maximum Module Load	770 mA at 5 V DC
Operating Temperature	0 to 60 °C
Rack Address Selection	Module switch setting
Data Exchange Timing	Synchronous with the controller scan
Diagnostic Handling	Remote I/O status is monitored and reported to the controller
Program Protection	Independent watchdog monitoring
Maximum Copper Distance	Up to 300 m using two Ethernet switches
Maximum Fiber Distance	Up to 40 km with appropriate fiber infrastructure

Official source:Honeywell ControlEdge HC900 Technical Information. Commercial availability, condition and warranty are seller terms.

Frequently Asked Questions

Which controller architecture is 900C73R-0100-44 intended for?
Use it with an HC900 redundant-controller arrangement that provides two controller-side communication paths.

How should the network cables be connected to 900C73R-0100-44?
Route one scanner link to each controller side and preserve the installed network topology.

What rack setting must be checked before installing 900C73R-0100-44?
Record and reproduce the remote-rack address selected by the module switches.

What power capacity is needed for 900C73R-0100-44?
Allow 770 mA from the rack’s 5 V DC supply for the scanner module.

How are remote I/O diagnostics handled by 900C73R-0100-44?
Detected module-status conditions are reported through the scanner to the controller.

What temperature range applies to 900C73R-0100-44?
Operate the module within 0 to 60 °C while maintaining the rack’s required ventilation.

What should engineers compare before replacing 900C73R-0100-44?
Check the full catalog number, hardware revision, rack address, controller pair and both Ethernet connections.

Compatibility & Ordering Notes

Before ordering 900C73R-0100-44: confirm the exact suffix, installed rack address, redundant CPU arrangement and network cabling.

Compatibility Checklist for 900C73R-0100-44

Match the complete catalog number and visible hardware revision.

Record both Ethernet connections and the rack address.

Confirm the redundant controller pair and remote-rack power budget.

Verify cabling, switches and maximum link distance before installation.

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