F5-MD0808N Flexem F5 Digital I/O Module Transistor Output Short-Circuit Protection

Flexem F5-MD0808N – 8‑point bipolar I/O module

Industrial‑grade mixed I/O with 8 digital inputs (sink/source) and 8 transistor outputs. Rated 24 VDC, 0.5 A per point, short‑circuit protected. Designed for high‑density machine control, sensor integration, and fast switching up to 1 kHz.

1. Key benefits & diagnostic edge

• Fast response: 34 µs turn‑on, 250 µs turn‑off – ideal for counting and positioning.
• Built‑in self‑recovery: after short circuit or overload, module recovers every 10 ms; no manual reset.
• Diagnostic friendly: per‑point LED status (input on/off, output on/off) on front panel.
• No derating up to 60 °C – full current 0.5 A per point, all points on.
• Wide input range 0–28.8 V with precise thresholds: state 1 >15 V, state 0 <5 V.

2. Technical specifications – Flexem F5-MD0808N

• Brand: Flexem · Model: F5-MD0808N · Series: F5 compact I/O
• ▸ Input section
  • 8 points, bipolar
    • Rated voltage: 24 VDC (range 0 … 28.8 V)
    • Rated current @24V: 7 mA (peak 9 mA)
    • ON‑state threshold: >15 V / >2.5 mA
    • OFF‑state threshold: <5 V / <1.0 mA
    • Input impedance: 3.3 kΩ
    • Filter time: 1 ms default (0 … 100 ms, 16 steps, unfiltered selectable)
    • Isolation: optocoupler, 500 V AC to logic
    • Cable max.: 100 m shielded, 50 m unshielded
    • Overvoltage limit: 30 V (1 h/day max.)
    • Compatible sensors: 2‑/3‑wire, source/sinking
• ▸ Output section
  • 8 transistor outputs, sourcing (PNP)
    • Rated voltage: 24 VDC (19.2 … 28.8 V)
    • Continuous current: 0.5 A per point, 0.5 A per group (all points in group)
    • Voltage drop @max load: ≤1 V
    • Leakage off‑state: <5 µA
    • Incandescent lamp max.: 2.4 W
    • Switching times: ON 34 µs / OFF 250 µs
    • Max output frequency: 1 kHz (resistive load)
    • Short‑circuit protection: yes, self‑recovery per 10 ms, peak current 1.3 A
    • Clamping voltage: 39 VDC ±1 V (integrated flyback diode)
    • Isolation: 500 V AC between output and logic
• ▸ Environmental & mounting
  • Operating conditions
    • Operating temperature: –20 … +60 °C (no derating)
    • Storage temp: –40 … +85 °C
    • Humidity: 5 … 95% RH, non‑condensing
    • Vibration / shock resistance: IEC 60068‑2‑6 / IEC 60068‑2‑27
    • EMC immunity: industrial environment, EN 61000‑6‑2

3. Installation & wiring guide

• DIN‑rail mounting (35 mm) · Removable spring‑clamp terminals
  • Wire size 0.2 … 1.5 mm² (AWG 24‑16), stripped 8 mm
  • Use shielded cable for lengths >50 m (EMC compliance)
  • Group outputs: common terminals per 4 points; keep total load ≤0.5 A per group
  • Inputs compatible with both NPN (sinking) and PNP (source) sensors

4. Compatibility & integration

• Works with Flexem F5 bus couplers (EtherCAT, Profinet, Modbus TCP)
  • 2‑/3‑wire proximity switches, limit switches, photoelectric sensors
  • Direct drive of small valves, relays, indicators (0.5 A max)
  • Approvals: CE, RoHS, UL (in process)

5. Commissioning & maintenance

• Front LED per point: green (input) / yellow (output) – quick status check
  • Filter time adjustable via software (0 … 100 ms) – debounce noisy contacts
  • Hot‑swap capable? only in bus‑power‑off state
  • Cleaning: dry air; no solvents; torque terminals 0.5 Nm

6. Typical applications

• Packaging machines – fast photocell counting + ejector control
  • Assembly lines – tool monitoring and solenoid actuation
  • Material handling – conveyor belt presence check + motor contactor
  • CNC auxiliary I/O – coolant, alarms, limit switches

7. Packaging & logistics

• Scope of delivery: F5-MD0808N module, 2x spring terminal plugs (included), quick start guide
  • Warranty: 12 months against material/ workmanship defects
  • Shipping: FedEx, UPS, DHL – worldwide express (tracking provided)
  • HS code: 85389091

8. Frequently Asked Questions (FAQ)

• Q: Can the F5-MD0808N source current or sink?Inputs are bipolar (source/sink). Outputs are sourcing (PNP) – they switch +24 V to the load.
• Q: What happens if I overload an output beyond 0.5 A?Short‑circuit protection activates. Output shuts off and retries every 10 ms. After overload removal it auto‑recovers.
• Q: My sensor provides only 10 V signal. Will it be detected as ‘1’?No, threshold for state 1 is >15 V. Use a sensor with 24 V output or add an interposing relay.
• Q: Which filter setting should I choose for a fast encoder?Unfiltered or 0 ms (if supported) – max input frequency approx. 2 kHz. For switches use 1–3 ms to debounce.
• Q: Can I parallel two outputs to drive a 1 A load?Not recommended – small differences in timing may cause one output to carry full current. Use an external relay.
• Q: Are there any known compatibility issues with 2‑wire proximity sensors?It works with most 2‑wire DC sensors as long as off‑state leakage <1 mA (module turns off reliably below 1 mA).

9. Selection guide – choose your variant

• F5-MD0808N (this model): 8 input / 8 output, transistor sourcing
  • F5-MD1616N: 16/16 points, same electrical characteristics
  • F5-AD0412N: analog combo 4AI/2AO for mixed signals
  • Need higher output current? Use F5‑RLY0800N (8 relay outs, 5 A).

10. Contact & inquiries

• Email: sales@powergearx.com
  • WhatsApp: +86 18030005825 (click for chat)
  • Technical support: support@powergearx.com
  • Web: www.powergearx.com

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