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
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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
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, the structure and principles of learning
Programmable controllers (Programmable Controller) should be referred to as PC, PC PC in order to distinguish, so referred to as programmable controller PLC (Programmable Logic Controller), but does not mean that PLC can control logic signal. Application and design of PLC is specifically designed for industrial environments, comes with an intuitive, simple and easy to … Continue reading PLC, the structure and principles of learning
How to improve the speed of PLC program running
1: according to actual needs, function block programming, writing subroutinesIn the PLC, subroutines are relatively independent of a specific control objective to develop the program. CALL subroutine call instruction is executed, if the subroutine call if the conditions are not met, the program scans only in the main program, and not to scan the routine, … Continue reading How to improve the speed of PLC program running
Output value of the analog input module in the normal reasons for beating with 32767
Question: I use two 1KF02 analog input module, provided separately for modules 1 and 2. Module configuration:Module 1, the first four-channel configuration for current signals, four channel configuration for RTD Pt100; first six channel module 2 configuration for RTD Pt100, two vacant channel, STEP7 will disable it. Current signals by two-wire connection, PT100 wire connection, … Continue reading Output value of the analog input module in the normal reasons for beating with 32767
What is DCS control system
DCS distributed control systems (Distributed Control System), short for domestic General called the distributed control system. It is a process control level and process monitoring levels of communication networks-a link to the multiple computer systems, integrated computer (Computer), communications (Communication), display (CRT) and a control (Control) 4 c technology, the basic idea is decentralized, centralized … Continue reading What is DCS control system
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