1. Product Overview

2. Main Features

• Hybrid I/O integration: 4AI / 2AO / 8DI / 4DO, compatible with 4–20 mA / 0–10 V standard signals.

• 16‑bit ADC/DAC: High accuracy (±0.1% FS typical) and low temperature drift (±0.2% FS over range).

• Software‑configurable: Signal type, engineering range, digital filtering, and operating mode.

• Full protection: Electrical isolation (1500 VDC), overvoltage, overcurrent, short‑circuit, and overtemperature.

• RS485 communication: Modbus RTU, default 9600 bps (configurable: 9600/19200/38400 bps).

• Wide temperature: −25 °C to +60 °C; storage −40 °C to +85 °C.

• Digital channels: NPN/PNP selectable; debounce time 0–500 ms adjustable.

• Analog channels: Digital filtering; fail‑safe (fixed/hold) on communication loss.

• Flame‑retardant housing: Compact, low power, high reliability; standard 35 mm DIN‑rail mounting.

3. Technical Specifications

3.1 General

• Model: 12P0678X032

• Power supply: 24 VDC ±10%

• Max current: 300 mA

• Isolation: 1500 VDC (field ↔ internal)

• Operating temp: −25 °C to +60 °C

• Storage temp: −40 °C to +85 °C

• Humidity: 5–95% RH, non‑condensing

• Mounting: 35 mm DIN‑rail

• Housing: Industrial flame‑retardant plastic

3.2 Channel Configuration

• Analog Input (AI): 4 ch, 4–20 mA / 0–10 V (software selectable)

• Analog Output (AO): 2 ch, 4–20 mA / 0–10 V (software selectable)

• Digital Input (DI): 8 ch, 24 VDC level compatible

• Digital Output (DO): 4 ch, 0.5 A per channel (max load)

3.3 Analog Performance

• Resolution: 16‑bit

• Accuracy: ±0.1% FS (25 °C)

• Temp drift: ±0.2% FS (−25 °C to +60 °C)

• AI load: Current ≤ 250 Ω; Voltage ≥ 100 kΩ

• AO load: Current ≤ 500 Ω; Voltage ≥ 1 kΩ

3.4 Communication

• Interface: RS485

• Protocol: Modbus RTU

• Default baud: 9600 bps

• Data format: 8N1 (8 data, 1 stop, no parity)

• Station address: 1–247 configurable

4. Safety Precautions

• Installation, wiring, and maintenance must be performed by qualified personnel.

• Disconnect power before wiring, disassembly, or maintenance to avoid electric shock.

• Do not install in explosive, flammable, corrosive, or conductive dust environments.

• Provide adequate ventilation; do not block heat dissipation gaps.

• Separate signal and power cables to reduce EMI.

• Connect the protective earth terminal to a reliable ground.

• Do not exceed channel rated loads to prevent permanent damage.

• Do not disassemble or modify the module without authorization.

5. Installation and Terminal Definition

5.1 DIN‑Rail Installation

1. Secure a standard 35 mm DIN‑rail to the panel.

2. Align the module’s upper clip with the rail edge.

3. Press downward until the bottom latch clicks into place.

4. Shake gently to confirm firm mounting.

5.2 Terminal Pin Assignment

5.3 Wiring Instructions

1. Strip 6 mm of insulation from wire ends.

2. Loosen terminal screws with a standard screwdriver.

3. Insert wires per the pin assignment; tighten screws securely (do not over‑tighten).

4. Use cable ties to relieve strain on terminals.

5. Analog signals: shielded twisted pair, single‑end grounded.

6. Digital/power cables: Stranded copper wire of suitable gauge.

6. Parameter Configuration

6.1 Connection

6.2 Configurable Parameters

Analog Input

• Signal type: 4–20 mA / 0–10 V

• Custom engineering range

• Digital filter: enable / disable, coefficient adjustment

Analog Output

• Signal type: 4–20 mA / 0–10 V

• Output calibration

• Fail‑safe: fixed value / hold last value (on communication loss)

Digital Input

• Logic: NPN/PNP

• Debounce time: 0–500 ms

Digital Output

• Logic: NPN/PNP

• Fail‑safe: ON / OFF (on communication loss)

• Pulse mode: width and interval settings

Communication

• Baud rate: 9600 / 19200 / 38400 bps

• Modbus address: 1–247

• Restore factory defaults

6.3 Save & Activate

7. Operation Description

7.1 Power‑on Self‑Test

7.2 Operating Modes

• AI: Acquire sensor analog signals → convert to digital → transmit to controller.

• AO: Receive control commands → convert to analog → drive valves/actuators.

• DI: Detect switch/sensor on‑off states → upload status changes.

• DO: Control external relays, solenoids, indicators per system commands.

• Communication: Exchange data/parameters with host via Modbus RTU.

7.3 LED Indicators

• Power (Green, steady): Normal power

• Power (Off): No power or fault

• Status (Green, flashing): Normal operation / communication active

• Status (Red, flashing): Overload, short circuit, or communication error

• Status (Red, steady): Hardware failure → replace module

8. Maintenance

• Periodically check LED status and terminal tightness; inspect for oxidation or looseness.

• Clean only with a dry soft cloth; no liquid/chemical solvents.

• Maintain ambient temp/humidity within specifications.

• Inspect cables for aging; replace damaged wiring promptly.

• Recalibrate analog channels if data is unstable or inaccurate.

9. Troubleshooting

1. Power LED off

   • Cause: No 24 VDC, reverse polarity, or broken wire

   • Solution: Check power supply and wiring polarity

2. Communication failure

   • Cause: Wrong baud rate/address, A/B lines reversed, missing termination resistor

   • Solution: Match parameters, correct wiring, add 120 Ω termination

3. AI data unstable

   • Cause: Loose terminals, incorrect range, or EMI

   • Solution: Secure wiring, confirm signal type, use shielded cable and proper grounding

4. AO inaccurate

   • Cause: Incorrect range or load mismatch

   • Solution: Reset engineering range; verify load resistance

5. DI no response

   • Cause: Wrong logic or loose wiring

   • Solution: Adjust NPN/PNP setting; tighten terminals

6. DO no action

   • Cause: Overload or incorrect logic

   • Solution: Reduce load to ≤0.5 A/channel; reconfigure logic

10. Warranty