Dead zone: also known as dead-zone width, control systems, some executing agencies if the action frequently, can result in slight shock, resulting in severe mechanical wear. From the control requirements, many systems also allow the controlled errors exist in a certain range. We allow the controlled size, width of dead zone known as PID;Dead-how does … Continue reading What is PID dead zone
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what is kind of External circuit of the PLC input form
PLC forms enter the external circuit of the external node is divided into the following three types:Passive node 1, input, namely: enter the switch node 2, NPN and PNP input3, diode input
Siemens programmed software and program structure
1. Programming softwareSiemens SIMATIC PLC series offers a variety of programming software, mainly STEP MICRO/DOS and STEP MICRO/WIN;STEP mini standard package STEP7S7 PLC programming language is very rich, includes LAD, and STL, SCL, GRAPH, HIGRAPH, CFC etc. Users can select a language, if required, can also be mixed using several programming languages.2. Program structureProgram structure … Continue reading Siemens programmed software and program structure
PLC: which hardware and software components
Programmable logic controller consists of CPU, memory, I/O interface circuits, peripheral interface, programming devices, power supplies and other components.
What needs attention in PLC application
1. Work environment(1) temperaturePLC required ambient temperature 0~55oC, installation cannot be placed in the heat element below, should be big enough ventilation space around.(2) climateIn order to ensure the insulation performance of PLC, the relative humidity of air should be less than 85% (no condensation).(3) motionPLC should be away from strong vibration source to prevent … Continue reading What needs attention in PLC application
What is a PLC automatic control system
In the 1960 of the 20th century United States introduction of programmable logic controllers (Programmable Logic Controller,PLC) instead of the traditional relay control device since the PLC have been developing rapidly, has been widely used all over the world. Meanwhile, PLC functionality has been improved. With computer technology, signal processing, control network technology and user … Continue reading What is a PLC automatic control system
Composition of the PLC configuration, CPU, I/O modules, power modules
Composition of the PLCIn terms of structure, PLC is divided into fixed and modular (modular) two. Fixed type PLC including the CPU board, I/O Board, display panel, a block of memory, power supply, these elements combine into a whole that is not removable. Modular PLC including CPU module, I/O modules, memory, power supply module, backplane, … Continue reading Composition of the PLC configuration, CPU, I/O modules, power modules
PLC program debugging
After the PLC program debugging through can only to users, or try to run. Field debugging to debug outline prepared in advance. According to the outline, step by step in an orderly manner.When you start debugging, the device may not work, not even charged. Progress step by step power available with debug, boot, loading, running … Continue reading PLC program debugging
PLC capacity formula
PLC including I/O points and user storage capacity the capacity of two aspects.Amount of storage capacity that is required by the user program is not only associated with the functions of the PLC system, but also with the capabilities of the program level. An experienced programmer and a beginner, when completing the same complex functions, … Continue reading PLC capacity formula
Difference between DCS control system and PLC control system
Differences from the basic structure of the DCS and PLC, DCS distributed control system of English (TOTALDISTRIBUTED CONTROL SYSTEM) for short. Refers to the control of dispersed risk, manage and display set. Late 60 programmable controller was developed as a logical operation (Programmable Logic Controller). Referred to as PLC. Mainly used in the automotive industry. … Continue reading Difference between DCS control system and PLC control system
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