1. Product Overview

2. Main Features

• Integrated 4AI / 2AO / 8DI / 4DO hybrid I/O design

• Compatible with standard 4~20mA current and 0~10V voltage analog signals

• 16-bit high resolution ADC/DAC, high precision and low temperature drift

• Full software configurable: signal type, engineering range, digital filter and working mode

• Built-in 1500VDC isolation, overvoltage, overcurrent, short-circuit and overtemperature protection

• RS485 communication interface, supports Modbus RTU protocol

• Multiple baud rates optional: 9600 / 19200 / 38400bps

• Wide operating temperature: -25℃ ~ +60℃

• Digital channels support NPN/PNP logic and 0~500ms adjustable debounce time

• Analog channels support digital filtering and communication loss fail-safe mode

• Flame-retardant engineering plastic housing, compact and low power consumption

• Standard 35mm DIN rail mounting, easy installation, wiring and maintenance

3. Technical Specifications

3.1 General Parameters

3.2 Channel Configuration

3.3 Analog Performance

3.4 Communication Parameters

4. Safety Precautions

1. Installation, wiring and maintenance must be completed by qualified professional technicians.

2. Cut off power supply before wiring, disassembly or maintenance to avoid electric shock and module damage.

3. Do not install in flammable, explosive or strong corrosive gas environment.

4. Keep ventilation unobstructed and do not block heat dissipation holes.

5. Power cables and signal cables must be laid separately to reduce electromagnetic interference.

6. Connect the protective grounding terminal to reliable earth ground.

7. Do not exceed the rated voltage, current and load of each channel.

8. Do not disassemble or modify the internal circuit without authorization.

5. Installation and Terminal Definition

5.1 DIN Rail Installation

1. Fix 35mm standard DIN rail firmly on the installation panel.

2. Buckle the upper card slot of the module onto the DIN rail edge.

3. Press the module down until the bottom lock clamps tightly.

4. Shake slightly to confirm firm installation without loosening.

5.2 Terminal Pin Assignment

5.3 Wiring Instructions

1. Strip about 6mm insulation from wire ends.

2. Loosen terminal screws and insert wires into corresponding terminals.

3. Tighten screws moderately to ensure good contact, avoid over-tightening.

4. Analog signal uses shielded twisted-pair cable with single-end grounding.

5. Power and digital signals use stranded copper wire with suitable gauge.

6. Fix cables with ties to avoid pulling force on terminals.

6. Parameter Configuration

6.1 Connection Method

6.2 Configurable Parameters

6.3 Save and Activation

7. Operation Description

7.1 Power-on Self-test

7.2 Function Description

• Analog Input: Collect sensor analog signals, convert to digital data and upload to control system.

• Analog Output: Receive control commands and output standard analog signals to drive valves and actuators.

• Digital Input: Detect switch and sensor on-off status, upload state changes.

• Digital Output: Control external relays, solenoid valves and indicator lights.

• Communication: Realize data exchange and parameter setting with upper computer via Modbus RTU.

7.3 Indicator Status

8. Daily Maintenance

1. Regularly check terminal tightness and prevent oxidation and loose contact.

2. Clean dust with dry soft cloth only, no liquid or chemical solvents.

3. Keep working temperature and humidity within specified range.

4. Replace aging and damaged cables in time.

5. Recalibrate parameters if sampling data is abnormal.

9. Troubleshooting

1. Power indicator not on

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

   Solution: Check power wiring and correct polarity
2. Communication failure

   Cause: Baud rate/address mismatch, RS485 A/B reversed, no terminal resistor

   Solution: Unify parameters, adjust wiring, add 120Ω terminal resistor
3. Analog input unstable

   Cause: Loose wiring, wrong signal range or electromagnetic interference

   Solution: Fasten terminals, confirm signal type, use shielded cable and good grounding
4. Analog output inaccurate

   Cause: Range error or load resistance mismatch

   Solution: Recalibrate range and match load parameters
5. Digital input no response

   Cause: Loose wiring or logic setting error

   Solution: Check wiring and adjust NPN/PNP logic
6. Digital output no action

   Cause: Overload or wrong logic mode

   Solution: Reduce load within rated range and reconfigure

10. Warranty Statement