Application Scenarios
In a large-scale ethylene cracking plant on the Gulf Coast, the distributed control system relied on Honeywell C300 controllers managing over 4,000 I/O points across the process unit. The existing termination boards in the control cabinet were showing signs of corrosion after years of exposure to trace chemical vapors in the cabinet environment, causing intermittent signal degradation and increasing the risk of unplanned shutdowns. The plant’s instrumentation team needed a replacement solution that could withstand the corrosive atmosphere while maintaining perfect signal fidelity for critical safety and control loops.
By deploying the 8C-TPOX01 with its G3 anti-corrosion coating, the maintenance crew was able to replace the aging termination assemblies during a scheduled turnaround. The 8C-TPOX01 delivered immediate value: its 64-point high-density configuration consolidated wiring for an entire I/O bank into a single compact board (29.3 × 12.0 × 6.5 cm), freeing up valuable cabinet space. More importantly, the 2500 V DC system-to-field isolation and integrated signal conditioning circuitry eliminated ground loop interference and protected the C300 controller from field-side transients — a frequent cause of nuisance trips in the original installation. Over the 18 months following the upgrade, the plant recorded zero I/O-related process upsets, and the 8C-TPOX01 boards showed no visible corrosion despite the aggressive environment. This scenario illustrates how the 8C-TPOX01 resolves the most critical pain points in process automation: maintaining signal integrity, surviving harsh industrial atmospheres, and providing a reliable, high-density I/O termination foundation for the Experion PKS platform.
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | 8C-TPOX01 |
| Part Number | 51307022-175 |
| Manufacturer | Honeywell International |
| Product Category | I/O Termination Board / IOTA PWA (Printed Wiring Assembly) |
| System Platform | Honeywell Experion® PKS / Series 8 / C300 DCS |
| Total I/O Points | 64 points (high-density signal termination) |
| Isolation Type | System-to-Field full electrical isolation (when externally powered) |
| Isolation Voltage | 2500 V DC |
| Supply Voltage | 24 V DC nominal (18–32 V DC operating range) |
| Current Consumption | Approx. 120 mA (typical) |
| Lead Resistance | 105 Ω |
| Coating | G3 anti-corrosion coating (8C model variant) |
| Mounting Method | Vertical mount on Series 8 I/O rack base |
| Dimensions (L×W×H) | 29.3 × 12.0 × 6.5 cm |
| Weight | Approx. 0.36 kg |
| Protection Rating | IP20 (cabinet installation) |
| Operating Temperature | -40°C to +70°C (G3 coated variant) |
| Storage Temperature | -55°C to +85°C |
| Humidity | 5–95% RH (non-condensing) |
| EMC Compliance | EN 61000-6-1 / -6-2 / -6-3 (industrial grade) |
| Redundancy Support | Compatible with redundant main module configurations |
| Certifications | CE, UL, CSA, TÜV, Class I Division 2 |
| Status | Actively supplied (not discontinued) |
Technical Principles and Innovative Values
Innovation Point 1: High-Density 64-Point Termination in a Compact Form Factor. The 8C-TPOX01 packs 64 signal termination points into a single board measuring just 29.3 × 12.0 × 6.5 cm. This density dramatically reduces control cabinet footprint — a single board handles what would otherwise require multiple smaller termination strips. For large-scale DCS installations with thousands of I/O points, the translates into significant cabinet space savings, reduced wiring labor, and simplified documentation.
Innovation Point 2: 2500 V DC System-to-Field Galvanic Isolation. At the heart of the ‘s design is robust electrical isolation between the control system side and the field wiring side. Rated at 2500 V DC isolation voltage, the board effectively breaks ground loops, suppresses electromagnetic interference, and prevents field-side faults from propagating into the C300 controller. This fail-safe isolation architecture is critical for protecting expensive control hardware and ensuring personnel safety in high-voltage industrial environments.
Innovation Point 3: G3 Anti-Corrosion Coating for Hostile Environments. The “8C” prefix in the model designation signifies Honeywell’s G3 anti-corrosion coating — a conformal coating applied to the printed wiring assembly that shields components from corrosive industrial atmospheres. This makes the ideally suited for petrochemical plants, offshore platforms, desalination facilities, and pulp & paper mills where H₂S, chlorine, and other corrosive agents rapidly degrade standard electronics. The coating extends the operational lifespan of the board by years in environments that would destroy uncoated alternatives.
Innovation Point 4: Integrated Signal Conditioning & Wide Voltage Tolerance. The incorporates signal conditioning circuitry that adapts 24 V DC digital signals and standard analog signals to the precise levels required by the C300 I/O modules. Its wide supply voltage tolerance (18–32 V DC) eliminates the need for tightly regulated power, while the 105 Ω lead resistance specification ensures accurate signal transmission over extended field wiring runs. This built-in intelligence reduces the need for external signal conditioners and simplifies system architecture.
Innovation Point 5: Full Industrial Certification & Hazardous Location Compliance. Carrying CE, UL, CSA, TÜV, and Class I Division 2 certifications, the is globally deployable and compliant with the world’s most stringent industrial safety standards. The Class I Division 2 certification is particularly valuable for installations in hazardous locations where explosive atmospheres may occasionally occur — a mandatory requirement in oil & gas, chemical, and pharmaceutical facilities.
