Eaton XTO2-F2208F

Technical Specifications

• Output Channel Configuration: 8 independent single-pole single-throw (SPST) Form A mechanical relay contact channels
• Relay Contact Rated Capacity: Each channel supports 250 V AC / 5 A resistive load, 30 V DC / 5 A resistive load
• Fieldbus Communication Interface: XIOC dedicated distributed bus, 1 Mbps maximum transmission rate
• Module Operating Power Supply: 24 V DC SELV control power input, maximum power consumption 6.5 W under full 8-channel active load
• Channel Isolation Standard: 2500 V AC galvanic isolation separating field load relay circuits and internal bus communication logic
• Response Latency: Relay mechanical actuation delay ≤ 10 ms from receiving PLC output command
• Overload Diagnostic Function: Contact overcurrent and coil open-circuit fault detection with digital fault flag transmission to PLC
• Physical Dimensions: 135 mm (H) × 82 mm (W) × 110 mm (D)
• Net Weight: 0.55 kg
• Mounting Standard: 35 mm top-hat DIN rail direct mounting inside remote field junction boxes
• Operating Temperature Range: -10 °C ~ +55 °C; storage temperature -40 °C ~ +80 °C
• Contact Mechanical Lifespan: 10,000,000 operations under no-load switching; 100,000 operations at full 5 A rated resistive load
• Environmental Humidity Tolerance: 10%–90% relative humidity without internal condensation

Core Functional Features

1. Mechanical relay contacts support mixed AC and DC heavy-load switching, compatible with solenoid valves, lighting banks, small contactor coils and alarm beacons
2. 2500 V AC full galvanic isolation per channel eliminates ground loop interference between central PLC low-voltage logic and field high-current loads
3. XIOC distributed bus architecture supports cascading up to 16 XTO/XIOC modules off one XC PLC CPU, with maximum bus cable length reaching 100 meters
4. Per-channel hardware fault diagnosis detects relay coil failure, wiring open circuit and load overcurrent; fault status uploaded to PLC real-time logic for alarm interlocks
5. Front panel dedicated LED status indicators for each relay channel power state and channel fault alarm for rapid on-site troubleshooting
6. Built-in surge absorption varistors across each relay coil to suppress reverse EMF generated by inductive loads and protect internal control circuitry
7. Flame-retardant industrial plastic housing with IP20 front panel protection for installation inside sealed field junction enclosures
8. Hot-pluggable XIOC bus communication connector allows module replacement without powering down the entire remote I/O station

Working Principle

Structural & Material Characteristics

• Outer Enclosure: UL94 V0 self-extinguishing PA66 industrial plastic shell, impact-resistant against minor on-site mechanical knocks
• Mounting Base: Integrated spring-loaded DIN rail buckle with lock tab to prevent module sliding under production line vibration
• Internal Relay Components: Silver alloy contact miniature power relays with anti-oxidation plating to extend service life in humid industrial environments
• Circuit PCB: Double-sided FR4 flame-retardant printed circuit board with separated power, communication and relay load wiring layers to reduce signal crosstalk
• Field Wiring Terminals: Large-capacity screw terminal blocks accepting 0.5 mm² to 2.5 mm² solid and stranded copper cables; terminal screws manufactured from anti-rust nickel-plated steel
• Front Indicator Panel: Transparent scratch-resistant polycarbonate window covering multi-color LED channel status lights
• Isolation Barriers: Molded plastic electrical separation dividers between low-voltage bus logic compartment and high-current relay load compartment inside the housing

Installation Requirements

1. Securely fasten onto standard 35 mm DIN rail inside a sealed IP54 or higher rated field junction enclosure to block dust, moisture and corrosive factory gas exposure
2. Separate high-current load wiring connected to relay output terminals from 24 V DC control power and XIOC communication cables with a minimum 30 mm routing gap inside the junction box
3. Connect the module’s dedicated grounding lug to the cabinet protective earth bus with minimum 1.5 mm² copper ground wire, ground resistance ≤ 4 Ω
4. Maintain vertical 15 mm minimum ventilation spacing between adjacent XTO or XIOC modules to dissipate heat generated during continuous relay switching cycles
5. Install external fuses on each field load circuit wire to provide secondary short-circuit protection independent of the module’s internal diagnostic circuits
6. XIOC communication bus cable must be industrial shielded twisted pair with shielding layer grounded only at the central PLC cabinet end, no dual-end grounding allowed

Application Scenarios

Operation & Maintenance Precautions

1. Never exceed the 5 A rated resistive load capacity per relay channel; prolonged overcurrent operation causes silver contact oxidation, arcing and permanent channel failure
2. For inductive AC loads (AC contactor coils, large solenoids), install external RC snubber circuits parallel to the load terminals to supplement onboard varistor surge protection
3. Inspect terminal block screw tightness every 6 months; loose wiring creates high contact resistance leading to terminal overheating and plastic housing deformation
4. Avoid installing the module inside enclosures with rapid temperature cycling or high condensation risk; moisture buildup inside the housing causes relay contact corrosion and short-circuit faults
5. When replacing faulty field loads, set the corresponding relay channel to OFF state via PLC programming software before disconnecting live load wiring
6. Track relay switching cycle count through PLC diagnostic registers; replace modules when approaching the rated mechanical lifespan to prevent unexpected contact sticking faults
7. Do not route AC mains power cables alongside XIOC communication bus wiring; induced electromagnetic noise corrupts fieldbus data transmission and triggers false channel fault alarms
8. Prevent liquid splashing onto the module front panel; IP20 housing does not provide protection against water ingress or chemical liquid exposure