---
title: "ModbusTCPSlaveユニット"
url: "https://maker.wiznet.io/scarlet/projects/modbustcpslave-unit/"
markdown_url: "https://maker.wiznet.io/scarlet/projects/modbustcpslave-unit/md"
type: "UCC: User Created Content"
author: "https://www.toolsbox.biz/"
author_url: "https://www.toolsbox.biz/product/STM32MINIShieldEvaluation/ModbusTCPSlaveUnit.html"
editor: "WIZnet"
editor_url: "https://maker.wiznet.io/"
original_author: "https://www.toolsbox.biz/"
original_url: "https://www.toolsbox.biz/product/STM32MINIShieldEvaluation/ModbusTCPSlaveUnit.html"
published: "2022-11-01"
language: "en"
likes: 6
views: 960
comments: 0
source: "WIZnet Makers (https://maker.wiznet.io/)"
---

# ModbusTCPSlaveユニット

> ModbusTCPSlave unit There are many I/O units with fixed functions in the world. Some people think that this one is easier to use.

Original author: https://www.toolsbox.biz/ (source: https://www.toolsbox.biz/product/STM32MINIShieldEvaluation/ModbusTCPSlaveUnit.html)

## Article

Modbus TCP Slave unit

> Last updated: March 9,
> 2021 Created: February 9, 2021

[![](https://www.toolsbox.biz/product/STM32MINIShieldEvaluation/ModbusShield.gif)](https://www.toolsbox.biz/product/STM32MINIShieldEvaluation/ModbusShield.gif)

> I thought I'd prepare a template for the ModbusSlave device.
> *The board size has been modified in consideration of Eagle's limitations.
>
> There are many I/O units with fixed functions in the world. Some people think that this one is easier to use. However, I thought it would be nice to have a device that can reach itchy places. * It is similar to [the Modbus model of industrialshields Inc.](https://www.industrialshields.com/shop/category/controllers-cpu-ios-com-plc-ethernet-controller-family-ethernet-plc-m-duino-1)
> It is handled by a mechanism that skips if it is not connected by preparing representative I/O in advance.
>
> I thought about the benefits of Modbus devices. Because of standardized communication specifications, client software can be covered by general-purpose products.
> It can be controlled with free software on iPhone and Nexus 7 beyond the barrier of OS. *However, it is not intuitive to use.
>
> The power supply for control is covered by the supply of 5V500mA from USB. Contact input/output supports DC24V. If ON/OFF control of AC power supply is required, it is realized through a relay unit.
> ADC (ADS1125) handles 0V to +10V with 16bit resolution. 2ch will be prepared.
> DAC (MCP4725) handles 0V to +5V with 12bit resolution. 2ch will be prepared.

![](https://www.toolsbox.biz/product/STM32MINIShieldEvaluation/ModbusBlock.gif)

> > (01) Coil contact 16 points Insulated output by photo coupler (open collector) It is assumed that 24V is applied.
> > * 32 points (2 words) are reserved internally, but 16 points are used as external terminals.
> >
> > (02) Read contact 16 points Photo coupler input Assuming a 24V input, a 22KΩ limiting resistor is inserted.
> > * 32 points (2 words) are reserved internally, but 16 points are used as external terminals.
> > It also displays alerts for input register values.
> >
> > (03) Holding register 16 words You can input and set the alert setting value, DAC output value, counter setting value, etc. for the input register value.
> >
> > (04) Input register 16 words Displays device information and specific input values

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Source: https://maker.wiznet.io/scarlet/projects/modbustcpslave-unit/