1. Product Overview

2. Main Features

• Compact high-density I/O integrated design, suitable for limited installation space

• 16-bit high precision for analog signal sampling and output

• Full software configurable signal type, channel range and working mode

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

• RS485 communication interface, supports standard Modbus RTU protocol

• Wide operating temperature range, adaptable to harsh industrial field environments

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

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

• Industrial flame-retardant plastic housing, low power consumption and high stability

• Support remote parameter setting, data reading and real-time monitoring

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 work to avoid electric shock and equipment damage.

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

• Keep sufficient ventilation clearance around the module; do not block heat dissipation slots.

• Power cables and signal cables shall be routed separately to reduce electromagnetic interference.

• The protective grounding terminal must be connected to reliable earth ground for safety and anti-interference performance.

• Do not operate beyond the rated load range of each input and output channel.

• 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 base.

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

3. Press the module downward until the bottom locking buckle snaps into place.

4. Slightly shake the module to confirm it is firmly fixed without sliding or loosening.

5.2 Terminal Pin Assignment

5.3 Wiring Instructions

1. Strip approximately 6mm insulation from the wire end.

2. Loosen terminal screws with a standard screwdriver.

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

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

5. Use cable ties to fix wiring to prevent pulling force on terminals.

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

7. Digital signal uses stranded copper wire with proper wire gauge.

6. Parameter Configuration

6.1 Connection Method

6.2 Configurable Parameters

Analog Input

Analog Output

Digital Input

Digital Output

Communication Setting

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 upper control system in real time.

• Analog Output: Receive control commands from the main controller and convert into standard analog signals to adjust valves, actuators and other execution devices.

• Digital Input: Detect on-off status of switches, sensors and relays, and upload status changes in real time.

• Digital Output: Turn on or off external relays, solenoid valves and indicator lights according to system control commands.

• Communication: Realize data interaction, parameter reading and writing with upper controller through Modbus RTU protocol.

7.3 Indicator Status Description

8. Daily Maintenance

• Regularly check indicator status and terminal tightness; inspect for oxidation and loose contact.

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

• Ensure the operating environment temperature and humidity are within the specified range.

• Periodically inspect aging of external cables and replace damaged wires in time.

• When module performance is abnormal, replace with the same model and reconfigure parameters.

9. Troubleshooting

1. Power indicator not lit

   Cause: No 24VDC input, power polarity reversed or wire broken

   Solution: Check power circuit and wiring polarity, restore normal power supply
2. Status indicator red flashing

   Cause: Output overload, short circuit, self-test failure or communication interruption

   Solution: Disconnect field load, eliminate short circuit and overload, restart module power
3. Analog input data abnormal

   Cause: Incorrect signal type setting, loose terminal or mismatched load resistance

   Solution: Reconfigure channel signal type, fasten terminals and match load parameters
4. Analog output inaccurate

   Cause: Improper range setting, excessive load resistance or poor contact

   Solution: Reset engineering range, control load within rated specification
5. Digital input no response

   Cause: Wrong logic configuration, loose wiring or sensor failure

   Solution: Adjust input logic parameters, check and fasten wiring
6. Digital output cannot switch normally

   Cause: Overload current, incorrect logic mode or loose terminal

   Solution: Reduce load current to rated range, reconfigure logic and tighten terminals
7. RS485 communication failure

   Cause: Mismatched baud rate or address, A/B signal line reversed, missing terminal resistance

   Solution: Unify communication parameters, correct A/B wiring, add matched terminal resistor

10. Warranty Terms