MODBUS Acquisition Module User Manual

1. Important Safety Information

1.1. Warnings

This product is not suitable for children under 14 years old.
This product is electronic; do not disassemble it without proper authorization.

1.2. Precautions

Operate electrostatic sensitive devices in an anti-static environment.
Avoid humid, high temperature, and corrosive environments.
If abnormal heat or smoke is detected, immediately cut off power and inspect the device.
Do not soak or wash the module.
Keep the module out of reach of children.

2. Product Overview

The MODBUS Acquisition Module is a versatile industrial control device designed for data acquisition and communication. It supports multiple protocols including MODBUS RTU, MODBUS TCP, S7, and MC, making it compatible with various industrial automation systems. These modules offer high performance, wide voltage input, convenient wiring, and flexible installation options.

Various models are available, including those with Ethernet ports for enhanced connectivity and different configurations of digital and analog inputs/outputs.

MODBUS Acquisition Module with Ethernet port — **Figure 2.1:** MODBUS Acquisition Module. This image shows two modules, one with an open cover revealing a DB9 port and terminal blocks, and another module next to it. Text on the image indicates support for MODBUS RTU/TCP/S7/MC protocols, high performance, wide voltage, easy wiring, flexible installation, and signal interference shielding.

3. Setup and Installation

3.1. Unpacking and Inspection

Carefully unpack the module and verify that all components are present and undamaged.

3.2. Power Connection

Before connecting, ensure the power supply is OFF.
Connect the positive and negative poles of the power supply correctly to the module's power terminals.
Do not exceed the rated voltage/current during use to prevent damage.

3.3. Wiring and Connections

The modules feature an anti-reverse connection design in the power circuit to effectively protect circuit safety.

Refer to the specific model's pinout diagram for correct wiring:

MODBUS-IO16R Product Details Pinout — **Figure 3.2:** MODBUS-IO16R Product Details. This diagram shows the terminal block layout for the MODBUS-IO16R module, detailing 16 relay outputs (1L 0.0 to 1.7), 16 digital inputs (1M 0.0 to 1.7), RS485 terminals (A, B), VCC, 0V, and a reset button. Pin 1 is NC, Pin 2 is GND, Pin 3 is 485A, Pin 4 is NC, Pin 5 is GND, Pin 6 is NC, Pin 7 is NC, Pin 8 is 485B, Pin 9 is NC.

3.4. Expansion Modules

Each MR2A module can support up to 10 EMA series expansion modules. These can be digital, analog, temperature, or weighing expansion modules.

**Figure 3.3:** Modbus I/O Expansion Module Setup. This diagram illustrates how multiple EMA series expansion modules (EMA-IO8R, EMA-AE8, EMA-AM8-4AI4AO, EMA-AQ8, EMA-AR8G) can be connected to an MR2A series module, which then communicates with an upper computer via RS485 Modbus RTU.

4. Operating Instructions

4.1. Communication Protocols

The module supports standard MODBUS RTU, MODBUS TCP, S7, and MC protocols, allowing for flexible integration into existing industrial networks.

4.2. Modbus RTU Communication

PLC, touch screens, and other host devices that support standard Modbus RTU can collect and control module data by connecting to the module's RS485 interface.

**Figure 4.1:** Modbus RTU Communication Function. This diagram shows an upper computer (laptop) connected via RS485 Modbus RTU to multiple MR2A series modules, which in turn are connected to EMA expansion modules (EMA-IO8R, EMA-AM8-4AI4AO, EMA-AR8G).

4.3. Parameter Configuration

A dedicated host computer software is available to set module parameters and save them permanently.

Dedicated Host Computer Software Interface — **Figure 4.2:** Dedicated Host Computer Software. This image displays the user interface of the dedicated software for configuring module parameters, showing input/output status, register addresses, baud rate settings, and other communication parameters.

5. Maintenance

Keep the module clean and free from dust.
Ensure the operating environment adheres to the specified temperature and humidity ranges.
Regularly check connections for tightness and signs of wear.
Avoid exposing the module to strong vibrations or impacts.

6. Troubleshooting

6.1. Frequently Asked Questions

What if there are scratches on the product? Contact the seller for assistance.
What if the product cannot be used? Contact the seller for support.

6.2. General Issues

No power/indicator lights: Check power connections and ensure the power supply is active and within the specified voltage range.
Communication failure: Verify RS485 wiring (A/B lines), baud rate, communication format, and address settings match between the module and the host device. Ensure no other devices are using the same address.
Abnormal heat or smoke: Immediately cut off power and inspect the module for any visible damage or short circuits. Do not reapply power until the issue is resolved.

7. Specifications

7.1. General Specifications

Brand Name: IUPAI
Type: Voltage Regulator
Condition: New
Origin: Mainland China

7.2. Detailed Parameters (MODBUS-IO16R Example)

**Figure 7.1:** MODBUS-IO16R Detailed Parameters. This image provides a table of specifications for the MODBUS-IO16R module.

MODBUS-IO16R Specifications
Parameter	Value
Input Points	16
Digital Input	Optocoupler isolated input
Input Signal Type	Switch contact signal or level signal
Input Signal Effective Range	>= 18V
Output Points	16
Output Type	Relay output, normally open contact
Contact Capacity	30VDC/5A, 250VAC/5A
Interface Type	RS485, DB9 male
Baud Rate	4800~115200
Communication Format	MODBUS RTU
Address Range	1~254
Working Voltage	DC 18V~35V; with anti-reverse protection
Power Consumption	2W~4W
Surge Protection	600W
Working Temperature	-20°C~+70°C
Storage Temperature	-40°C~+85°C
Installation Method	Rail mount
Dimensions (LWH)	125mm * 80mm * 50mm

7.3. Expansion Module Specifications

**Figure 7.2:** EMA Series Expansion Module Specifications. This image displays a table detailing specifications for EMA-AR8G, EMA-AW4G, EMA-AM8-4AI4AO, EMA-AE8, EMA-AQ8, and EMA-IO8R modules.

**Figure 7.3:** MR2A Series Module Specifications. This image displays a table detailing specifications for MR2A-IM24R and MR2A-IM24TP modules.

8. User Tips

Always double-check all wiring connections before applying power to prevent damage to the module or connected equipment.
For optimal performance and stability, ensure proper grounding of the module and associated equipment.
When using expansion modules, ensure compatibility and proper addressing to avoid communication conflicts.

9. Warranty and Support

For any warranty claims, technical support, or inquiries regarding product usage, please contact the seller directly through your purchase platform. Provide your order details and a clear description of the issue for prompt assistance.

IUPAI MODBUS Acquisition Module Series