1. General Description

• Model: 140EHC20200C

• Brand: Schneider Electric

• Series: Modicon Quantum

• Channels: 2 independent counter channels

• Max Frequency: 500 kHz (differential), 250 kHz (single‑ended)

• Coating: Conformal coated (for dust/moisture resistance)

2. Specifications

2.1 Counter Channels

• Quantity: 2 independent channels

• Resolution: 32‑bit signed (−2,147,483,648 to +2,147,483,647)

• Max Input Frequency:

  • 500 kHz (differential RS‑422 inputs)

  • 250 kHz (single‑ended TTL inputs)

• Input Types (per channel):

  • A/B quadrature (×1, ×2, ×4 decoding)

  • Pulse + Direction

  • Up/Down count

  • Event/gate input

• Filter Time: Configurable (100 ns to 10 μs)

2.2 Electrical Inputs

• Differential (RS‑422): ±200 mV to ±5 V compliant

• Single‑ended (TTL): 5 V DC logic level

• Discrete Input Voltage: <30 V DC

• Input Resistance: 10 kΩ

• Isolation: 1,780 Vrms (channel‑to‑backplane, 60 s)

2.3 Digital Outputs

• Quantity: 4 high‑speed FET outputs

• Voltage: 5–24 V DC

• Max Current: 0.5 A per output

• Protection: Short‑circuit (2.5 A fuse), overload, 36V transient suppression

• On‑state Voltage Drop: <0.4 V

2.4 Power & Environment

• Backplane Power: 5 V DC, 650 mA

• Power Dissipation: ≤4 W

• External Power: 19.2–30 V DC (for outputs)

• Operating Temperature: 0 °C to +60 °C

• Storage Temperature: −40 °C to +85 °C

• Humidity: 5–95 % non‑condensing

• Certifications: CE, UL, CSA, RoHS

• Coating: Conformal coated (140EHC20200C only)

2.5 Mechanical

• Form Factor: Single slot, Quantum rack

• Dimensions (W×H×D): 104 × 40 × 250 mm

• Weight: ~0.3 kg

• Connector: 40‑pin terminal block (ordered separately)

3. Operation Modes (per channel)

1. Incremental (Quadrature)

   A/B phase decoding; direction auto‑detect; ×1/×2/×4 resolution.
2. Pulse + Direction

   Count pulses with separate direction input (CW/CCW).
3. Up/Down Counter

   Two inputs: one for count up, one for count down.
4. Event Counter

   Counts edges (rising/falling) with gate/enable control.
5. Period/Frequency Measurement

   Measures pulse period (μs) or frequency (Hz) with configurable gate time.

4. LED Indicators

• PWR: Green = backplane power OK

• RUN: Green = module active & configured

• ERR: Red = fault (config, wiring, overload)

• CH1, CH2: Green = counting activity

• OUT1–OUT4: Green = output active

5. Installation

1. Power off the Quantum rack.

2. Insert module into any empty slot; seat firmly.

3. Secure front panel screws.

4. Wire encoders/sensors to the 40‑pin terminal block:

   • Use shielded twisted‑pair cable for differential signals.

   • Separate high‑speed signals from power lines.

5. Power on; verify PWR and RUN LEDs are green.

6. Configuration (EcoStruxure Control Expert / Unity Pro)

1. Add 140EHC20200C to hardware configuration.

2. For each channel:

   • Select mode (Incremental, Pulse+Dir, Up/Down, Event)

   • Set input type (Differential RS‑422 / Single‑ended TTL)

   • Configure filter time, preset values, and output mapping

3. Assign 4 outputs to I/O addresses.

4. Download configuration to PLC; check ERR LED.

7. I/O Data Mapping

• Counter Values: 32‑bit signed integers in PLC memory (CH1, CH2).

• Preset Registers: Configurable compare values per channel.

• Status Bits: Count direction, overflow, underflow, index pulse capture.

• Outputs 1–4: Mapped to discrete output table; set via logic or compare events.

8. Applications

• High‑speed encoder counting (500 kHz max)

• Position/speed control for conveyors, machine tools, packaging

• Frequency/period measurement (tachometers, flow meters)

• Motion sequencing & event triggering

• Harsh‑environment installations (coated version: 140EHC20200C)

9. Diagnostics & Troubleshooting

• PWR Off: Check backplane power; re‑seat module.

• RUN Off: Verify CPU in RUN; re‑download config.

• ERR On: Check wiring, encoder power, config errors, or output overload.

• No Counting: Confirm encoder type (differential/single‑ended), wiring, and frequency limits.

• Count Errors: Adjust filter time; check for electrical noise (use shielded cable).

10. Reference Documents

• Official Manual: Modicon Quantum 140EHC20200 User Manual

• Publication No.: 043504489 (Rev 6.0, 2023)

• Software: EcoStruxure Control Expert (Unity Pro) v8.0+

• Coating Note: 140EHC20200C = 140EHC20200 + conformal coating