CN2650186Y

CN2650186Y - Programmeable controller

Info

Publication number: CN2650186Y
Application number: CN 03211045
Authority: CN
Inventors: 李进
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-01-16
Filing date: 2003-01-16
Publication date: 2004-10-20
Anticipated expiration: 2013-01-16

Abstract

A programmable controller is provided, which adopts a programmable logic part CPLD as the semiconductor part, firstly compiles a gate circuit in CPLD into a logic gate circuit with respect to the input/output, various switch signals (24V) can be entered into the CPLD through an LED and optical coupler, output the operational results through the CPLD logic operation, then isolate and amplify by the optical coupler and drive the relay to response, the relay contact can output the switching signal output to the control site equipment. The utility model has simple structure, less elements, low cost, repeated programming, high running speed, high reliability and interference resistance, not decoding, etc., and has the same input/output interface and logic control functions as that of the programmable controller.

Description

A kind of Programmable Logic Controller

[technical field] the utility model relates to a kind of Programmable Logic Controller, and this Programmable Logic Controller can be widely used in the various automation equipments.

[background technology] existing Programmable Logic Controller (PLC) can be widely used in various automation equipments, and it is simple that it has programming, the reliability height, and advantage such as anti-interference is good has played vital role in industrial automation is controlled.But also come with some shortcomings: 1, components and parts are many, cost is high; 2, its " programmable functions " just works when using first, seldom needs reprogramming again after equipment operation is normal, especially some approved products, typical products in mass production, be basically a program copy in each PLC, make resource waste in a large number.

[summary of the invention] the purpose of this utility model is to overcome the deficiency of above-mentioned prior art and a kind of Programmable Logic Controller is provided.

The purpose of this utility model realizes by following technological means.

A kind of Programmable Logic Controller has identical input/output interface of Programmable Logic Controller and logic control function.It is characterized in that this Programmable Logic Controller adopts programmable logic device (CPLD) as semiconductor devices, first gate circuit with CPLD inside is compiled into the gate circuit with the corresponding logical relation of I/O, various switching signals (24V) enter CPLD through light emitting diode and optical coupling device, operation result is exported in logical operation through CPLD, isolate and amplify through the optical coupling device again and drive the relay adhesive, the contact of relay is exported switching signal, removes to control field apparatus.

CPLD provided by the utility model i.e. ' programmable logic device (PLD) ', it is a kind of novel semi-conductor device that develops rapidly in recent years, it is to use VLSI (very large scale integrated circuit) technology, on a chip integrated several ten thousand and even a hundreds of thousands gate circuit, and can programme, connect up each gate circuit, form a logic controller.The Programmable Logic Controller of being made up of CPLD has following characteristics: 1. simple in structure, components and parts are few.2. have identical input/output interface of Programmable Logic Controller and logic control function.3. with low cost, descend 40%.4. can programme repeatedly.5. travelling speed is fast.6. reliability height, anti-interference are good.7. can not decode.

Programmable Logic Controller by CPLD forms can partly replace existing Programmable Logic Controller, owing to have the identical input/output interface of Programmable Logic Controller, it is very convenient to substitute original Programmable Logic Controller.Again owing to the existing great market of Programmable Logic Controller, so the market outlook of this new controller are very good.

[description of drawings] Fig. 1 is the utility model circuit theory diagrams.

Introduce the utility model embodiment in detail below in conjunction with accompanying drawing.

[embodiment] a kind of Programmable Logic Controller of forming with CPLD has identical input/output interface of Programmable Logic Controller and logic control function.First gate circuit with CPLD inside is compiled into the gate circuit with the corresponding logical relation of I/O, on-the-spot various switching signals (24V) enter CPLD3 through light emitting diode 1 and optical coupling device 2, operation result is exported in logical operation through CPLD, isolate and 4 adhesives of amplification drive relay through optical coupling device 2, the contact of relay 4 is exported switching signal, removes to control field apparatus.Circuit description as shown in the figure: 1, light emitting diode, do the I/O indication.2, optical coupling device plays on-site signal and internal signal buffer action.3, CPLD programmable logic device (PLD).4, relay plays on-site signal and internal signal buffer action, and with the contact form output signal.

Claims

A kind of Programmable Logic Controller, have identical input/output interface of Programmable Logic Controller and logic control function, it is characterized in that said Programmable Logic Controller adopts programmable logic device (CPLD) [3] as semiconductor devices, earlier with CPLD[3] inner gate circuit is compiled into the gate circuit with the corresponding logical relation of I/O, various switching signals enter CPLD[3 through light emitting diode [1] and optical coupling device [2]], through CPLD[3] logical operation exports operation result, isolate and amplify driving relay [4] adhesive again through optical coupling device [2], the contact of relay [4] is exported switching signal.