libmodbus

How to Control Mitsubishi Inverters with Mitsubishi PLC via RS-485 Communication

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How to Control Mitsubishi Inverters with Mitsubishi PLC via RS-485 Communication

Click the above ” Technical Training ” and select “Pin the Official Account“ 160,000+ industrial control professionals follow this WeChat platform: technical sharing, learning exchange, industrial control videos Methods for Mitsubishi PLC to Control Mitsubishi Inverters: Using the PLC’s digital output to control the inverter (i.e., directly connecting the PLC’s digital output to the inverter’s … Read more

Example | Mitsubishi PLC Controls Inverter via RS485

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Example | Mitsubishi PLC Controls Inverter via RS485

Search on WeChat Technical Training Preparation Required hardware: Mitsubishi FX3G PLC, RS485 communication module (FX3G-485BD), one Inovance inverter, touch screen (MT6071IP). Required knowledge: PLC communication protocol, command sending, inverter communication parameter settings. Wiring The wiring is quite simple. Insert the FX3G-485-BD module into the PLC, short SDB and RDB, short SDA and RDA. Connect the … Read more

Understanding RS485 Communication

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Understanding RS485 Communication

Before discussing RS485 communication, it is necessary to mention RS232 communication. If you are not familiar with RS232 communication, don’t worry. You have definitely seen and used the RS232 interface (if you don’t believe it, you can check behind your desktop computer at home). In fact, many people use the Siemens PCPPI programming cable to … Read more

Common PLC Interfaces and Communication Protocols Worth Learning

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Common PLC Interfaces and Communication Protocols Worth Learning

Point“Jinan CNC Mold Technology Research Institute” focus Industry frontier, mechanical videos, CNC processing technology, 3D printing, industrial robots, productionprocesses, molds, machine tools, and other cutting-edge information are waiting for you here! Today, I will share several common interfaces and communication protocols for Siemens PLC. 1 Difference Between RS232 and RS485 Interfaces 1. Physical Structure of … Read more

Understanding Modbus RTU, ASCII, and TCP Protocols

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Understanding Modbus RTU, ASCII, and TCP Protocols

01 Terminology Interpretation 1 word = 2 bytes; 1 byte = 8 bits. Checksum: A checksum is derived from the preceding data through a certain algorithm to verify the correctness of the data set. When inputting codes as data into a computer or other devices, input errors can easily occur. To reduce such input errors, … Read more

Why Your PLC and Touch Screen Always Fail to Communicate?

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Why Your PLC and Touch Screen Always Fail to Communicate?

Many technicians have the following problems. In fact, aside from the communication methods defined by manufacturers, the most common reasons for communication failure in projects can be summarized as follows: Have you selected the correct communication protocol (Modbus, RS232 free protocol, CANopen, EtherCAT)? Is the communication cable properly made ( RS232 RXD TXD GND RS485 … Read more

How Many Communication Methods Are There for Siemens PLC?

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How Many Communication Methods Are There for Siemens PLC?

Hello everyone, good evening~ Today, I will introduce how many communication methods are available for Siemens PLC. Siemens PLC is a brand that many people frequently use, so today I will share the various ways to achieve communication with Siemens PLC in upper computer development. Here, we can explain from three aspects: serial communication, Ethernet … Read more

Siemens S7-300 PLC and Modbus Communication DCS Control System Design

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Siemens S7-300 PLC and Modbus Communication DCS Control System Design

Click↑↑Technical Training, follow and pin to subscribe for free for a long time 180,000+ industrial control professionals are following the WeChat platform: technical sharing, learning exchange, industrial control videos This article introduces how to achieve communication between Modbus and Profibus-DP protocol devices, the application of the Modbus to Profibus-DP gateway PM-160, and the communication methods … Read more

MODBUS TCP Communication Between Schneider M580 and Siemens S7200 SMART

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MODBUS TCP Communication Between Schneider M580 and Siemens S7200 SMART

WeChat Search Technical Training The M580 is Schneider’s medium to large PLC, powerful in functionality, while the S7 200 SMART is Siemens’ small PLC, widely used in industrial settings where communication between two PLCs is often required. The M580 supports both MODBUS TCP and Ethernet/IP industrial Ethernet protocols, and the S7 200 SMART can also … Read more

Siemens 200smart Modbus RTU Communication Example

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Siemens 200smart Modbus RTU Communication Example

Siemens 200smart Modbus RTU Communication Example Communication Materials: 1) Two PLCs, namely the 200smart CR60 and SR20; 2) Two DP connectors (6ES7972-0BX12-0XA0) 3) Several connecting wires (for PLC power and communication) Verification Content: Set: CR60 PLC as the master station, sending the PLC system clock (8 bytes of information) to the SR20 slave station; the … Read more