1. Product Overview

2. Main Features

• Professional 6-channel DC voltage high-precision synchronous acquisition design

• High-resolution sampling chip, ensuring stable and accurate signal conversion

• Built-in electrical isolation, effectively isolating industrial site interference and protecting backend equipment

• Integrated overvoltage, reverse connection, overcurrent and surge protection functions

• Support standard industrial voltage signal input, suitable for mainstream field sensors and equipment

• Compact structure, easy DIN rail mounting, convenient installation and wiring

• Low power consumption, long-term stable continuous operation

• Strong EMC anti-interference ability, adaptable to harsh industrial electromagnetic environment

• Support software parameter configuration, channel calibration and data filtering setting

3. Technical Specifications

3.1 General Parameters

3.2 Acquisition Channel Parameters

3.3 Communication Parameters

4. Safety Precautions

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

• Cut off all power supply before wiring, installation or maintenance work to avoid electric shock and module damage.

• Do not install the module in environment with flammable gas, explosive dust or strong corrosive gas.

• Keep enough ventilation space around the module, do not block heat dissipation gaps.

• Signal lines and power lines shall be laid separately to avoid electromagnetic interference.

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

• Do not input voltage beyond the rated range to prevent permanent burnout of the module.

• Do not disassemble or modify the internal circuit structure without authorization.

5. Installation and Terminal Description

5.1 DIN Rail Installation

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

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

3. Press the module downward until the bottom lock snaps tightly.

4. Shake the module slightly to confirm firm installation without loosening.

5.2 Terminal Definition

5.3 Wiring Instructions

1. Strip about 6mm insulation layer at wire ends.

2. Loosen terminal screws with a screwdriver, insert wires into corresponding terminals.

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

4. Voltage signal lines are recommended to use shielded twisted-pair cable.

5. Fix wiring with cable ties to prevent pulling and loose contact.

6. Do not mix high-voltage circuit and signal circuit wiring.

6. Parameter Configuration

6.1 Connection Method

6.2 Configurable Items

• Modbus communication address and baud rate setting

• Channel enable/disable configuration

• Digital filtering coefficient adjustment

• Upper and lower limit alarm threshold setting

• Channel manual calibration and zero point correction

• Restore factory default parameters

6.3 Save and Take Effect

7. Working Principle and Operation

7.1 Power-on Self-test

7.2 Working Description

• The module performs real-time cyclic sampling of 6-channel DC voltage signals.

• Internal circuit isolates, filters and converts the collected signals.

• Convert analog voltage signals into standard digital Modbus data.

• Upper computer or PLC reads each channel voltage data through RS485 Modbus RTU.

• Support real-time monitoring, data recording and over-limit alarm function.

7.3 Indicator Status

8. Daily Maintenance

• Regularly check terminal wiring tightness, prevent oxidation and loose contact.

• Clean module surface dust regularly with dry soft cloth, do not use liquid solvent.

• Keep working environment temperature and humidity within rated range.

• Regularly check aging of signal cables and power lines, replace damaged wires in time.

• If abnormal data occurs, recalibrate channel parameters and check wiring.

9. Troubleshooting

1. No power indicator

   Cause: No 24VDC input, reverse power polarity or wire break

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

   Cause: Wrong baud rate/address, RS485 A/B reversed, bus terminal resistance missing

   Solution: Unify communication parameters, adjust A/B wiring, add matching terminal resistor
3. Abnormal voltage acquisition data

   Cause: Signal wiring loose, input over-range or site interference too strong

   Solution: Fasten wiring, confirm input within 0~100VDC, use shielded cable and good grounding
4. Individual channel no data

   Cause: Single channel input circuit fault or wiring disconnection

   Solution: Check channel input wiring, recalibrate or replace module if hardware damaged

10. Warranty Terms