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Key Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Honeywell |
| Model / Part Number | CP-EXPIO |
| System Compatibility | Honeywell ComfortPoint Open (CPO-PC500 / CPO-R Series) |
| Operating Power Supply | 24 VAC (±20%, 50/60 Hz) or 24 VDC (±15%) |
| Power Consumption | Max 12 VA / 5 W |
| Communication Bus | RS-485 Panel Bus / Sylk Bus Protocol |
| Addressing Method | Onboard Hexadecimal Rotary Switches |
| Universal Inputs (UI) | Configurable for 0-10V, 4-20mA, NTC10k, NTC20k, PT1000, Dry Contact |
| Relay / Digital Outputs (DO) | Form-A / Form-C Relay Outputs (24 VAC/VDC, 2A max) |
| Analog Outputs (AO) | 0–10 VDC (max 11 VDC, 11 mA source) |
| Operating Temperature | 0 to 50 °C (32 to 122 °F) |
| Mounting Type | 35 mm DIN Rail or Direct Panel Wall Mount |
Product Introduction & Supply Chain Strategy
The Honeywell CP-EXPIO is a modular Expansion I/O board designed to seamlessly increase point density for ComfortPoint Open (CPO) HVAC plant controllers. It aggregates temperature sensors, pressure transmitters, valve actuators, and fan status relays, routing operational telemetry over an RS-485 Panel Bus back to the central processor.
Sourcing this unit as New Surplus delivers direct protection against facility downtime while maintaining a low Total Cost of Ownership (TCO). This product is a Brand New Surplus unit. It is not used, not pulled from a decommissioned plant, and not refurbished. All modules undergo rigorous quality verification to ensure OEM-level reliability. Storing 1–2 backup units on-site safeguards building management systems (BMS) against catastrophic HVAC loss and emergency lead-time delays.
CP-EXPIO
CP-EXPIO
Installation & Configuration Guide
1
Stage 1: Pre-Installation (Prep & Safety)
Prerequisite & LOTO
1.Stage 1: Pre-Installation (Prep & Safety):Prerequisite & LOTO.
Isolate power to the controller cabinet by executing Lock-Out/Tag-Out (LOTO) procedures on the primary 24 VAC transformer line. Strap on a grounded ESD wrist band before unboxing the module. Take high-resolution photographs of terminal block connections and rotary address switch settings on the unit being replaced.
Verification: Confirm zero AC/DC voltage across the power terminals with a calibrated digital multimeter.
2
Stage 2: Removal
3 min
2.Stage 2: Removal:3 min.
Disconnect the pluggable screw terminal headers to preserve field sensor wiring. Press the bottom DIN-rail release latch downward using a flathead screwdriver and tilt the chassis outward from the rail.
Verification: Inspect plug-in terminal blocks for charring, oxidation, or loose wire strands.
3
Stage 3: Installation (Clone & Seat)
5 min
3.Stage 3: Installation (Clone & Seat):5 min.
Set the two rotary address switches on the new CP-EXPIO to match the exact panel bus ID of the original module. Hook the top DIN-rail clip onto the rail and snap the lower latch into place. Re-attach all field wiring terminal plugs tightly.
Verification: Verify that the rotary address switches reflect the identical Panel Bus node configuration assigned in Honeywell CPO Studio software.
4
Stage 4: Power-On & Testing
Commissioning
4.Stage 4: Power-On & Testing:Commissioning.
Re-energize the 24 VAC/VDC power transformer. Monitor the diagnostic status LEDs during initialization to verify communication handshake with the master plant controller.
Verification: Confirm the Power LED shines solid green and the RS-485 Rx/Tx LEDs flicker steadily, indicating valid network polling.
Firmware/Software Versions & Upgrade Notes
- Recommended Software Tool: Honeywell ComfortPoint Open Studio (CPO Studio) V3.x or higher.
- Compatibility Constraints: Ensure the CP-EXPIO bus address matches the hardware target configured in the master CPO-PC500 control application. Re-binding I/O points in the engineering tool is required if changing the physical address node.
- Upgrade/Downgrade Warning: Modifying firmware on live Panel Bus networks without backing up controller logic risks dropping communication across all downstream expansion cards. Always archive the CPO project file (*.cpo) before swapping modules or flashing software revisions.
Frequently Asked Questions (FAQ)
Is this Honeywell CP-EXPIO module brand new or refurbished?
This product is a Brand New Surplus unit. It is not used, not pulled from a decommissioned plant, and not refurbished. All modules undergo rigorous quality verification to ensure OEM-level reliability. It is shipped in original ESD-safe packaging.
How does New Surplus compare to refurbished alternatives on the market?
Refurbished BMS modules frequently suffer from degraded electrolytic capacitors, weakened relay contacts, and concealed thermal stress caused by years of continuous field operation. A failed refurbished relay can lock critical chiller pumps or air handlers off during extreme weather, causing massive process downtime. Investing in New Surplus guarantees full factory lifespan and complete operational peace of mind.
What level of quality testing does this unit undergo before shipping?
Every CP-EXPIO module passes a thorough SOP quality check. This includes physical terminal inspection, anti-counterfeit serial verification, 24 VDC bench power-up validation, and RS-485 bus communication checks on our testing rigs.
Can I hot-swap the CP-EXPIO while the system is running?
Hot-swapping is strongly discouraged. Removing terminal blocks under active 24 VAC power can cause voltage spikes across the RS-485 Panel Bus transceivers, potentially damaging communication chips on adjacent expansion units.
What warranty coverage is included with this purchase?
We support this New Surplus CP-EXPIO board with a full 1-year replacement warranty, giving you complete procurement reliability without OEM lead times.
