Programmable computer controller, referred to as PCC (programmable computer controller), as a new concept in the mid-90 in the industrial sectors, which is different from the programmable logic controller PLC (program logic controller) and IPC IPC (industry personal computer) of a new generation of programmable computer controller, Represent the development trend of industrial control technology.PCC … Continue reading Difference between PCC and PLC, and IPC
Category: plc program
Correct selection of PLC in the automatic control system design
PLC (programmable logical controller, PLC for short) has been increasingly used in industrial control systems, and plays a very important role in the automatic control system. Therefore, it is very important for the correct selection of PLC.Numerous suppliers of various types of PLC, each of them has advantages and disadvantages, to meet user needs, but … Continue reading Correct selection of PLC in the automatic control system design
PLC’s structure and function of each part
The structural variety of programmable controllers, but the General principles of its composition are basically the same, are based on the microprocessor architecture. Usually consists of a central processing unit (CPU), memory (RAM and the ROM), input/output (I/O), power supply and programmer in several parts.1. The central processing unit (CPU)CPU as the core of PLC, … Continue reading PLC’s structure and function of each part
PLC (Programmable Logic Controller) introduced
PLC late 60 in the United States, comes first, and was called the programmable logic controller PLC (Programmable Logic Controller), aims to replace the relay, to perform a logical sequence control functions such as judgment, timer and counter. PLC's basic design idea is to computer functions, flexible, general advantages and relay control system easy to … Continue reading PLC (Programmable Logic Controller) introduced
Siemens PLC basic classification
1. S7 series: traditional PLC product, S7-200 is for the low performance requirementsSmall PLC. S7-300 is a modular-type small and medium PLC, up to 32 modules can be extended.S7-400 is a large PLC can be expanded more than 300 modules. S7-300/400 formMPI, PROFIBUS or industrial Ethernet, etc.2. M7-300/400: the S7-300/400 the same structure, it can … Continue reading Siemens PLC basic classification
Difference between Panasonic PLC and Siemens PLC
Siemens and Japan have different input and output Panasonic, Japan Panasonic enter only x, output only y.In fact, language is the same, that is different, both can be converted.1. the programming of the software differencesSiemens SIMATIC PLC series offers a variety of programming software, mainly STEPMICRO/DOS and STEPMICRO/WIN; STEPmini standard package STEP7.S7 PLC programming language … Continue reading Difference between Panasonic PLC and Siemens PLC
S7-200 programs instructions cannot be used
"S7-200 programs, there are those that do not can be used? I did a lot of subroutines, subroutine repeatedly calls without any problems, but there is a subroutine is invoked, each loop inside the first command that calls the subroutine works, while the second call is null and void. If this subroutine and then recopy … Continue reading S7-200 programs instructions cannot be used
PLC sequential control design method
Sequential control design method is the basic idea of the system connected to the order of a working cycle is divided into several stages, these stages are known as step (Step). Sequential function chart (SFC) is mainly composed of steps, to the connections, transformations, transitions, conditions and actions.Figure 1 is a diagram on how to … Continue reading PLC sequential control design method
Classification of PLC
1. Classification by structureAccording to the PLC's structure, PLC can be divided into two types of monolithic and modular.(1) integrated PLC-PLC as a whole is the power supply, CPU, I/O interfaces and other components are collected in a single chassis, has the characteristic of compact structure, small size, low price. Small PLC uses this monolithic … Continue reading Classification of PLC
Introduction to PLC programming
Early programmable logic controller referred to as programmable logic controllers (Programmable Logic Controller,PLC), it is mainly used to replace relay logic control. With the development of technology, which uses microcomputer technology of industrial control equipment is already far exceeds the scope of logic control, therefore, such devices are called programmable controller, referred to as PC. … Continue reading Introduction to PLC programming
PLC ONE 