Honeywell XCL5010 Direct Digital Controller

The Honeywell XCL5010 is a freely programmable computer module designed for building management systems (BMS) and HVAC automation within the Honeywell Excel 500 / Excel 5000 family. Operating as a direct digital controller (DDC), it manages process control routines, distributed I/O modules, and system-wide communications. Without an integrated display, operator access relies on external units like the XI582AH interface or PC-based software tools.

Process Control and System Capacity

The controller executes application code programmed using Honeywell's CARE engineering software. It supports up to 16 distributed I/O modules, handling as many as 128 physical data points and 256 pseudo data points across connected field equipment. Internal Flash EPROM holds system applications, allowing firmware updates over network interfaces.

Network Integration and Data Retention

Multiple communication interfaces allow the controller to operate within open LONWORKS networks or proprietary C-bus environments. LonTalk protocol support enables peer-to-peer data exchange across building control subnetworks. In the event of a total power failure, an onboard gold capacitor maintains system RAM and real-time clock data for up to 72 hours without requiring battery replacements.

Cabinet Installation Guidelines

• Mount the module directly onto a standard DIN rail inside a control cabinet; door mounting is not supported for this form factor.
• Connect the unit to an isolated 24 VAC Class 2 transformer, ensuring low-voltage control circuits remain separated from power wiring.

Frequently Asked Questions

Q: Does the XCL5010 feature a built-in screen or keypad?A: No, the XCL5010 does not have an integrated display. Monitoring and configuration require an XI582AH operator interface or PC-based operator software.

Q: How is controller data saved when line power is cut?A: An internal gold capacitor backs up volatile RAM and real-time clock settings for up to 72 hours during power outages, eliminating battery disposal concerns.