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Modbus POE ETH IO 8CH

Modbus_POE_ETH_IO_8CH

This product is an industrial-grade 8DI / 8DO isolated digital input/output module controlled via dual Ethernet interfaces. It supports both dry contact and wet contact inputs, utilizes Modbus RTU/Modbus TCP protocols, and features PoE (Power over Ethernet) capability. This relay module is very easy to use. Due to its fast communication, stability, reliability, and safety, it is an ideal choice for industrial control equipments and/or applications with high communication requirements.

SKUProduct
33917Modbus POE ETH IO 8CH

Product Parameters​

ParameterSpecification
Supply VoltageDC 7~36 V
Power Supply MethodsPoE Ethernet port, DC 5.5*2.1 power jack, or screw terminal (7 ~ 36 V)
Communication InterfacePoE Ethernet port, supporting IEEE 802.3af standard
Digital Input8DI, 5 ~ 36 V, dry contact/wet contact (NPN or PNP type), built-in bidirectional optocoupler
Digital Output8DO, 5 ~ 40 V, open-drain output, output load 500 mA/channel (MAX)
Modbus ProtocolModbus RTU protocol or Modbus TCP protocol

LED Indicator Descriptions​

LED IndicatorStatus Description
RUN LEDEthernet port running indicator. After the Ethernet port is working normally, it outputs a square wave with a period of 2 seconds
STA LEDMCU indicator. Flashes when the MCU is operating normally
TXD LEDTransmit indicator, lights up when transmitting data
RXD LEDReceive indicator, lights up when receiving data
Left Port Green LEDIlluminates when Ethernet port 1 is connected to an Ethernet network
Right Port Green LEDIlluminates when Ethernet port 2 is connected to an Ethernet network
Left Port Yellow LEDIlluminates when a TCP connection is established. Can be used to check if a communication link is established between the module and the host software
Right Port Yellow LEDData activity LED. The state of this yellow LED changes when data is being transmitted over the Ethernet port, useful for determining if data transfer is occurring

Basic Functions​

Supports reading switch inputs by sending Modbus RTU protocol commands via Ethernet, thereby controlling the digital outputs based on the input states

Modbus RTU PWM Output 4CH Interface Introduction

Wiring Instructions​

Ethernet Port Wiring​

Modbus RTU PWM Output 4CH Interface Introduction

Connect the module to the local network using an Ethernet cable. Power the module via the 7~36V power terminal or via PoE. Both Ethernet ports have the same functionality and can be used for network communication and cascading.

Digital Input Wiring​

Modbus RTU PWM Output 4CH Interface Introduction
DI1-DI8 are the 8-channel signal input terminals. DGND is the common ground for the signal terminals. DICOM is the common terminal for input signals; it can be left floating, connected to the positive power supply, or connected to the negative power supply. Power can be drawn directly from the main supply or from an independent power source.

  • DICOM not connected (floating): Dry contact (passive) input

    Modbus RTU PWM Output 4CH Interface Introduction

  • DICOM connected to positive power supply: Low-level trigger, NPN-type wet contact (active) input, voltage 5V-30V DC

  • DICOM connected to negative power supply: High-level trigger, PNP-type wet contact (active) input

    Modbus RTU PWM Output 4CH Interface Introduction

Digital Output Wiring​

The output uses NPN Darlington transistors. DOCOM is the common terminal for the freewheeling diodes and should be connected to the positive terminal of the output power supply. The wiring diagram is as follows:

Modbus RTU PWM Output 4CH Interface Introduction