Terminal & Physical Interface Configuration

• Terminal Layout: Total 36 gold-plated screw terminals, 32 signal terminals + 4 shared power/shield terminals, one-to-one mapping for all single-width cFP I/O modules
• Terminal Pitch: Standard 5.08 mm industrial terminal spacing, compatible with universal prefabricated terminal jumper wires
• Wiring Specification: Support solid/stranded copper wire 12 AWG (max 2.05 mm²) ~ 24 AWG (0.22 mm²); stripping length 6.5 mm
• Mounting Mode: Snap-on direct locking installation on cFP I/O module rear panel, no extra screws or DIN rail brackets required
• Mechanical Parameters: Dimension 50 × 40 × 15 mm, bare weight 201 g, black flame-retardant PA66 housing, IP20 ingress protection

Electrical Rating Parameters

• Per-Terminal Continuous Current: Max 4 A single signal terminal; shared power terminals support 6 A aggregated current
• Max Working Voltage: 300 Vrms CAT II channel-to-chassis, compliant with industrial low-voltage field wiring standards
• Screw Torque Standard: 0.4 ± 0.05 N·m, over-tightening will crack terminal plastic base
• Contact Resistance: ≤10 mΩ initial gold-plated contact resistance, anti-oxidation for long-term cabinet operation
• Dielectric Withstand: 1500 Vrms 1-minute inter-terminal insulation withstand

cFP-CB-1 vs cFP-CB-3 Core Difference

• Temperature Structure: cFP-CB-1 non-isothermal common copper bus, obvious terminal temperature gradient; cFP-CB-3 independent isothermal routing for thermocouple cold junction compensation
• Applicable Signals: cFP-CB-1 for digital I/O, 4-20mA current, 0-10V voltage; cFP-CB-3 dedicated for thermocouple/RTD temperature signals
• Thermal Drift: cFP-CB-1 causes up to 2.8 ℃ cold junction error for thermocouple measurement; cFP-CB-3 error ≤0.2 ℃
• Cost & Usage: cFP-CB-1 universal low-cost for most conventional I/O; cFP-CB-3 high-precision dedicated temperature accessory

Vibration & Mechanical Reliability Design

• Built-in Strain Relief: Integrated plastic wire clamping buckle, prevents wire fatigue breakage under 5 grms long-term random vibration
• Operating Vibration: 5 grms 10–500 Hz random vibration, 5 g sinusoidal vibration compliant with IEC 60068
• Locking Structure: Dual-side elastic snap lock, anti-loose even after 1000 times module hot swapping
• Terminal Anti-loose: Spring washer built into every screw terminal, avoids loosening caused by cabinet fan resonance

Environmental & Safety Compliance

• Operating Temperature: -40 ℃ ~ +70 ℃; Storage Temperature: -55 ℃ ~ +85 ℃
• Humidity Rating: 10%–90% RH non-condensing operation, 5%–95% RH non-condensing storage
• Hazardous Certification: Matches cFP I/O modules for Class I Div 2, Zone 2 explosive environment use
• Safety Standards: IEC 61010-1, UL 61010-1, Pollution Degree 2, max working altitude 2000 m
• EMC Compliance: CE/FCC Class A, RoHS compliant, no electromagnetic signal attenuation for shielded wiring

Compatibility Matching List

• Compatible I/O Modules: All single-width cFP series modules: cFP-AI-111, cFP-DO-403, cFP-DI-301, cFP-AO-210
• Incompatible Devices: Standard FP series modules (match FP-TB-1 instead), dual-width cFP modules, C-series CompactRIO modules
• Matching Backplanes: cFP-BP-4, cFP-BP-8 compact FieldPoint backplanes
• Official Status: Fully end-of-life, no official restock, only aftermarket used/new inventory available

On-Site Wiring Precautions

• Signal Isolation: Separate analog low-level signals and high-current digital output wiring on different terminal rows to avoid crosstalk
• Inductive Load Wiring: When matching cFP-DO-403, route solenoid wiring within 45cm for external flyback diodes
• Cold Junction Warning: Forbid using cFP-CB-1 for thermocouple acquisition, must replace with cFP-CB-3 to eliminate temperature drift
• Hot Swap Operation: Do not unplug cFP-CB-1 during module hot swapping, prevent signal short circuit between exposed terminals

Pros & Limitations

• Pros: Universal compatibility for all single-width cFP modules, compact snap-on installation, built-in vibration strain relief, gold-plated anti-oxidation terminals, wide extreme temperature adaptability, unified terminal mapping for easy wiring debugging
• Limitations: Non-isothermal structure invalid for thermocouple signals, no inter-terminal insulation baffles, limited 4A single-terminal current, obsolete discontinued accessory without after-sales support

Official Product Images & Visual Reference

• Single Terminal Block Render: Black miniature plastic terminal block, 36-row side screw terminals, rear snap locking groove
• Assembly Photo: cFP-CB-1 locked on cFP-DO-403 module rear side, complete module terminal assembly
• Contrast Photo: Side-by-side comparison of cFP-CB-1 and cFP-CB-3 housing appearance
• Document Source: NI official manual 373280D, unwatermarked original factory images and terminal pinout drawings