Today, we will learn about the Siemens PLC control of a frequency inverter to implement a three-speed control circuit. First, let’s take a look at the schematic diagram:From the schematic diagram above, let’s analyze the components needed, and I have prepared an image for you: Parameter Settings:Pr.77: Parameter write prohibition selection: Parameter value is 1 … Read more
1. The new ABB RW7 robot has migrated the system signals to the controller. When in use, predefined DI/DO signals can be associated with it to allow the external PLC to start the robot. The specific steps are as follows:1.1. Predefine the DI/DO signals in the I/O engineering tool, as detailed in the configuration of … Read more
In-Depth Analysis of Siemens PLC Programming: From Concept to Practice Learning and mastering Siemens PLC programming cannot be limited to just instructions and software operations. It is an art of designing and implementing automation control logic. The core idea can be summarized as: translating the actions of physical devices and process flows into deterministic logical … Read more
Documenting some observations from my first use of the Siemens 1214. First, regarding the wiring, this Siemens model supports both NPN and PNP input configurations. I previously thought that Siemens inputs could only be configured as PNP. The common terminal for its inputs is marked as M, which led me to believe it could only … Read more
Mitsubishi DRVA Instruction Programming Example The DRVA instruction of Mitsubishi PLC (taking the FX series as an example) is used for absolute positioning control, which specifies the target position based on the origin for single-speed positioning actions. The instruction format is: DRVA S1 S2 D1 D2, where: S1: Target position (absolute address, in pulse counts, … Read more
The GPIO pins of the ESP32 or Raspberry Pi 5 can collect signals to be processed by Siemens PLC, and then return the processed results to the GPIO pins of ESP32 or Raspberry Pi 5, achieving bidirectional communication and control. The following are the specific implementation methods:1. Hardware ConnectionUsing Digital SignalsESP32/Raspberry Pi 5 → Siemens … Read more
1. Basic Concept of OB Definition: An Organization Block (OB) is a program block called by the CPU operating system to perform specific functions. Users write programs in the corresponding OB, and the CPU automatically executes it when the corresponding event occurs. Priority: Each OB has a different priority. A high-priority OB can interrupt a … Read more
Core Difference: Time is a data type used to store time values (e.g., 10 seconds); Timer is a functional component used to implement timing logic (e.g., triggering an action after a delay of 10 seconds). Essentially, it is a “device that works with Time values.” The specific differences can be quickly distinguished by two points: … Read more
The analog input and output control of Siemens PLC has a wide range of applications in the field of industrial automation. This article will provide a detailed introduction to the applications of Siemens PLC analog input and output control, including instruction introduction, programming methods, hardware connections, and common issues. In industrial control, the processing of … Read more
How to Encrypt PLCs?Nowadays, the application of automation equipment is becoming increasingly widespread, and PLCs, as the main control system, play a significant role. However, due to the conflicting interests between the client and the contractor, both parties are brainstorming ways to encrypt or decrypt PLCs to maximize benefits and minimize losses.As a result, programmers … Read more