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Problems to be noticed in PLC installation
PLC is applicable to most industrial sites, but it still has certain requirements for use occasions, ambient temperature, etc. Controlling the working environment of PLC can effectively improve its working efficiency and life. 1. When installing PLC, avoid the following places: (1) The ambient te...Read more -
Connection between DCS system and PLC system
PLC control and DCS control system are not a logical concept. PLC is named after its function and DCS is named after its architecture. In principle, PLC can form DCS. Of course, the performance difference between the two still exists, depending on the product and needs. Differences between DCS ...Read more -
Introduction to main performance indicators of PLC
1. Storage capacity Storage capacity refers to the capacity of user program memory. The capacity of user program memory is large, and complex programs can be compiled. Generally speaking, the user memory capacity of small PLC is thousands of words, while that of mainframe is tens of thousands of ...Read more -
Comparison between Siemens PLC and Panasonic PLC
1、 Siemens PLC programming software and program structure (1) Siemens PLC programming software Siemens provides many kinds of programming software for SIMATIC series PLC, mainly STEPMICRO/DOS and STEPMICRO/WIN; STEP; Standard software package STEP7. The programming languages of S7 series PLC a...Read more -
What are the main interference sources in Siemens PLC system
(1) Radiated interference from space Radiated electromagnetic field (EMI) in space is mainly generated by power network, transient process of electrical equipment, lightning, radio broadcasting, television, radar, high-frequency induction heating equipment, etc. It is usually called radiated inte...Read more -
Mitsubishi PLC programming operation instructions
Correspondence between program transmission speed and PLC programming tool When the following interfaces are used between FX3U/FX3UC programmable controller and GX Development (Ver.8.13P or above), the program can be written/read and monitored at high speed (115.2 kbps). FX-30P can communicate wi...Read more -
Classification of PLC
There are many kinds of PLC products, and their specifications and performance are also different. The classification of PLC is generally based on the difference of its structure, function and I/O points. 1. Classification by structure According to the structure of PLC, PLC can be divided into tw...Read more -
PLC performs limited scanning
The PLC can be specified to perform a limited number of scans on the program (from 1 scan to 65535 scans). By specifying the number of scans the PLC runs, the change of program process variables can be monitored. At the first scan, the SM0.1 value is 1. 1. Execute a single scan “single scan...Read more -
Differences between industrial personal computer and PLC, ordinary computer
The difference between IPC and PLC is not in their looks, nor in their working environment, but in their functions. As far as development is concerned, they come from different ways. PLC comes from electrical logic control characterized by relay, and industrial control computer comes from compute...Read more -
Testing of PLC during manufacturing
Practice has proved that most of the failures of PLC products are caused in the manufacturing process. In the manufacturing process, the most important thing to ensure the reliability and stability of products is product testing. Only through complete and comprehensive testing can problems in pro...Read more -
Handling of Key Problems in the Cooperative Use of PLC and Frequency Converter
How to use the inverter properly The connection of PLC and inverter becomes the key to the success of the system. 1. PLC switch command signal input The input signal of the frequency converter includes switch type command signals for operation of running/stop, forward/reverse rotation, inching an...Read more -
What is the switching value/digital value/analog value of PLC
Switching value: there are only two states of switching value, 0 and 1, including input and output, which reflect the state. Digital quantity: digital quantity is composed of multiple switching quantities. For example, three switching values can form a digital value representing eight states. Ana...Read more -
Main differences between DCS control system and PLC control system
PLC control system and DCS control system are not a concept on a logical level. It can be seen from the name that PLC is named by function and DCS is named by architecture. In principle, PLC can form DCS. Of course, there are still performance differences between the two, depending on the product...Read more -
Main differences between DCS control system and PLC control system
PLC control system and DCS control system are not a concept on a logical level. It can be seen from the name that PLC is named by function and DCS is named by architecture. In principle, PLC can form DCS. Of course, there are still performance differences between the two, depending on the product...Read more -
What is the essential difference between PLC and SCM?
1. PLC is a relatively mature control system composed of single chip microcomputer, and it is the product of a mature and stable single chip microcomputer application system that has been debugged. It has strong universality. 2. Microcontroller can constitute a variety of application systems, wit...Read more -
Summary of 13 learning experiences on PLC programming
PLC programming is an electronic system for digital operation. It uses programmable memory to store the instructions for executing logic operation, sequence control, timing, counting and arithmetic operation, and control various types of machinery or production processes through digital and analo...Read more -
Easy to master PLC control system design
Design principle of PLC control system (1) Practicability Practicality is the basic principle of control system design. While studying the controlled object, engineers should also understand the use environment of the control system, so that the designed control system can meet all the requiremen...Read more -
Steps for correct power off and power on of DCS
DCS power off correctly When the DCS needs to be powered off for maintenance due to overhaul or other reasons, we often directly power off the DCS, but sometimes this non-standard operation will bring serious consequences, such as configuration loss, PID parameter loss, etc. Therefore, it is nece...Read more -
How to distinguish large, medium and small PLC?
There are many kinds of PLC products, and their specifications and performance are also different. The classification of PLC is generally based on the difference of its structure, function and I/O points. 1. Classification by I/O points (1) Small computer. The total number of input and output poi...Read more -
PLC controller’s main anti-interference measures
For the PLC controller power supply, should use non-power line power supply, directly from the low-voltage distribution room on the main bus using a special line power supply. Choose isolation transformer, and transformer capacity should be larger than the actual needs of about 1.2 to 1.5 times, ...Read more