1. Product Overview

2. Main Features

• Integrated hybrid I/O design, compatible with standard 4~20mA current and 0~10V voltage signals

• 16-bit high-resolution ADC/DAC, ensuring high accuracy and low drift for analog signals

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

• Built-in isolation, overvoltage, overcurrent, short-circuit and over-temperature protection

• Standard RS485 communication interface, supports Modbus RTU communication protocol

• Wide operating temperature range, adapts to complex industrial electromagnetic environment

• Digital channels support NPN/PNP logic selection and adjustable debounce time

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

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

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

3. Technical Specifications

3.1 General Parameters

3.2 Channel Configuration

3.3 Analog Performance

3.4 Communication Parameters

4. Safety Precautions

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

• Disconnect all power supply before wiring, disassembly or maintenance to avoid electric shock and module damage.

• Do not install the module in environments with flammable gas, explosive dust, corrosive vapor or conductive particles.

• Keep sufficient ventilation space around the module and do not block heat dissipation gaps.

• Signal cables and power cables shall be laid separately to reduce electromagnetic interference.

• The protective grounding terminal must be connected to reliable earth ground.

• Do not exceed the rated load of each input and output channel to prevent permanent damage.

• Do not disassemble, modify or refit the internal structure of the module without authorization.

5. Installation and Terminal Definition

5.1 DIN Rail Installation

1. Fix the standard 35mm DIN rail firmly on the mounting surface.

2. Align the upper buckle of the module with the DIN rail edge.

3. Press the module downward until the bottom lock snaps into place.

4. Slightly shake the module to confirm firm installation without sliding.

5.2 Terminal Pin Assignment

5.3 Wiring Instructions

1. Strip about 6mm insulation from wire ends.

2. Loosen terminal screws with a standard screwdriver.

3. Insert wires into corresponding terminals strictly according to pin definition.

4. Tighten screws moderately to ensure reliable contact; avoid over-tightening.

5. Fix cables with cable ties to prevent pulling stress on terminals.

6. Analog signal adopts shielded twisted-pair cable with single-end shield grounding.

7. Digital signal and power wiring use stranded copper wire with suitable wire gauge.

6. Parameter Configuration

6.1 Connection Method

6.2 Configurable Parameters

Analog Input

Analog Output

Digital Input

Digital Output

Communication Settings

6.3 Save and Activation

7. Operation Description

7.1 Power-on Self-test

7.2 Working Mode

• Analog Input: Collect analog signals from field sensors, convert into digital data and upload to control system in real time.

• Analog Output: Receive control commands and convert into standard analog signals to regulate valves and actuators.

• Digital Input: Detect switch and sensor on-off status, upload signal changes in real time.

• Digital Output: Control external relays, solenoid valves and indicators to switch on and off.

• Communication: Realize data interaction and parameter configuration with upper controller via Modbus RTU.

7.3 Indicator Status

8. Daily Maintenance

• Regularly check indicator status and terminal tightness, inspect for oxidation and looseness.

• Clean module surface only with dry soft cloth; do not use liquid or chemical solvents.

• Keep operating temperature and humidity within specified range.

• Periodically check cable aging and replace damaged wires in time.

• Recalibrate parameters if sampling data is abnormal.

9. Troubleshooting

1. Power indicator off

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

   Solution: Check power line and wiring polarity, restore normal power supply
2. Communication failure

   Cause: Mismatched baud rate/address, A/B line reversed, missing terminal resistor

   Solution: Unify communication parameters, correct wiring, add matched terminal resistor
3. Analog input data unstable

   Cause: Loose terminals, wrong signal range or site interference

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

   Cause: Improper range setting or load resistance mismatch

   Solution: Reset engineering range, match load parameters
5. Digital input no response

   Cause: Wrong logic setting or loose wiring

   Solution: Adjust input logic and check terminals
6. Digital output no switching

   Cause: Overload current or incorrect logic

   Solution: Reduce load and reconfigure parameters

10. Warranty Terms