It is recommended to use the python-snap7 library, which provides comprehensive support for reading and writing the I/Q areas and DB blocks of Siemens S7 series PLCs. Below are two of the most commonly used examples:Reading and Writing I/Q Areas and Reading and Writing DB Blocks.1. Install pip install python-snap7 2. Connect to the PLC … Read more
Click the blue text to follow us 1 Task Objective This task focuses on the analog functionality of the Siemens S7-1200 PLC, with the core scenario being “analog control of Delta frequency inverter to achieve motor speed control”. The analog module of the S7-1200 PLC can achieve dual functions: First, it outputs analog signals to … Read more
Basic instructions for the Siemens S7-1200 PLC. For beginners, mastering these basic instructions is the cornerstone of building complex automation programs. We will categorize them by function and explain with simple examples. Please note that all instructions are used in Siemens TIA Portal (Totally Integrated Automation Portal).1. Preparation before programming: Understanding the TIA Portal interface1. … Read more
Stop struggling with complex PLC logic and typing code line by line! Here’s a secret: your programming “superhero” teammate is now online! When the German industrial powerhouse — Siemens S7-1200 PLC meets the domestic AI “strongest brain” — DeepSeek, a revolutionary programming transformation is taking place. This is not just talk! I will guide you … Read more
PLC debugging is the “last mile” of electrical project implementation—no matter how perfectly the program is written or how standard the wiring is, if there are issues during the debugging phase, the equipment will not operate normally. Many engineers, when first encountering debugging, often fall into the trap of “power on with no response → … Read more
1 PLC Hardware The Siemens S7-1200 PLC CPU can add up to three communication modules on the left side, such as the CM1241 (RS485), and up to eight digital/analog input/output modules on the right side. During the hardware configuration of the PLC, the TIA Portal software will automatically recognize and prompt the user. The variety … Read more
When first learning PLC programming, many people wonder: in what form do the values we set, such as “Temperature 25℃”, “Pressure 0.4MPa”, and “Motor Speed 1500r/min”, exist in the PLC’s CPU? Why do we need to distinguish between “byte”, “word”, and “double word” when writing programs? Today, we will start from the most fundamental binary … Read more
In automation control, analog signals are ubiquitous. Whether it is temperature, pressure, flow, or even position signals, they can be converted into voltage or current analog signals. As a type of continuously variable input signal, accurately measuring and converting analog signals is the foundation of an excellent control system. Mastering a reliable method for analog … Read more
Data acquisition in milliseconds is achieved using the Siemens S7-1200 series PLC in conjunction with custom-developed upper computer software. 1. Siemens S7-1200 series PLC; 2. Analog data acquisition module; 3. Data acquisition archived to the upper computer, curve recording; 4. Support for chart and curve printing.
Standard Structure of PLC Alarm Programs Standardized Programming: Use abbreviated variable names, and describe functions accurately in comments, such as the input interface variable name Active (bool type, comment as Alarm Message), CBFW (bool type, comment as Control Bit Warning/Fault (0=Warning /1=Fault)). Block Title and Detailed Description: The block title is limited to a one-line … Read more