CN102392784A

CN102392784A - PLC (programmable logic controller) control system for pitch control systems

Info

Publication number: CN102392784A
Application number: CN2011102821856A
Authority: CN
Inventors: 傅建民; 邓杰
Original assignee: Reenergy Electric Suzhou Co Ltd
Current assignee: Reenergy Electric Suzhou Co Ltd
Priority date: 2011-09-22
Filing date: 2011-09-22
Publication date: 2012-03-28

Abstract

The invention discloses a PLC (programmable logic controller) control system for pitch control systems, which comprises a CPU (central processing unit) module, an encoder module, an analog output module and a CAN (controller area network) communication module which are connected with one another; the PLC control system also comprises a self-made extension module; the self-made extension module comprises a main chip module, an optocoupler circuit, an operational amplifier circuit, an output transistor and a CAN transceiver; the main chip module comprises a main chip, which is integrated with a digital input module, a digital output module, an analog input module and a CAN interface module; an input end of the optocoupler circuit is connected with an external digital input module, and an output end of the optocoupler circuit is connected with the digital input module; an input end of the output transistor is connected with the digital output module, and an output end of the output transistor is connected with an external output circuit; external analog signals are connected with the analog input module through the operational amplifier circuit; and the CAN interface module is connected with the CAN communication module through the CAN transceiver. The invention uses the self-made extension module to replace the extension module of the conventional PLC, consequently, the cost is reduced, and the reliability is high.

Description

The PLC control system of pitch-controlled system

Technical field

The invention belongs to the programmed control system field, especially a kind of PLC control system of pitch-controlled system.

Background technique

At present, in the wind power pitch-controlled system, mainly still rely on PLC to realize overall control to system; PLC control system commonly used is as shown in Figure 1, comprises the CPU module, coder module; Analog output module, digital quantity input module, analog amount load module and digital quantity output module.Because high efficiency and the high reliability of PLC; Make its application in pitch-controlled system very extensively, almost the pitch-controlled system of the overwhelming majority all is the control that realizes pitch-controlled system with this form, yet; PLC fancy price and external technical monopoly but become " stumbling-block " that wind-powered electricity generation reduces cost; How when guaranteeing reliability, reducing cost of success become pendulum presses for solution in face of enterprise problem.

Summary of the invention

In view of the defective that above-mentioned existing technology exists, the objective of the invention is to propose a kind of PLC control system of new pitch-controlled system, intact that reduces external PLC technology relies on, thereby reduces the cost of wind power pitch-controlled system, guarantees high reliability simultaneously.

The object of the invention will be achieved through following technological scheme:

A kind of PLC control system of pitch-controlled system comprises the CPU module, coder module, and analog output module is equipped with a CAN communication module, said CPU module, coder module interconnects between analog output module and the CAN communication module; Also comprise a self-control expansion module; Said self-control expansion module comprises the master chip module, photoelectric coupled circuit, discharge circuit, output transistor and CAN transceiver; Said master chip module comprises master chip, is integrated with DIM digital input module on the said master chip, digital output module, analog amount load module and CAN Interface Module; The input end of said photoelectric coupled circuit is connected with the external digital load module, and the output terminal of said photoelectric coupled circuit is connected with said DIM digital input module; The input end of said output transistor is connected with said digital output module, and the output terminal of said output transistor is connected with outside output circuit; External analog signal is connected with said analog amount load module through said discharge circuit; Said CAN Interface Module is connected with said CAN communication module through the CAN transceiver.

Preferably, the PLC control system of above-mentioned pitch-controlled system, wherein: said master chip is the LPC11C24 chip.

Preferably, the PLC control system of above-mentioned pitch-controlled system, wherein: said CAN transceiver is the CTM1050T module.

Outstanding effect of the present invention is:

The present invention proposes a kind of PLC control system of new pitch-controlled system, replace the expansion module of former PLC, reduced dependence fully, thereby reduced the cost of wind power pitch-controlled system, guarantee high reliability simultaneously external PLC technology with the self-control expansion module.

Following constipation closes embodiment's accompanying drawing, and specific embodiments of the invention is done further to detail, so that technological scheme of the present invention is easier to understand, grasp.

Description of drawings

Fig. 1 is the PLC control system schematic representation of existing technology;

Fig. 2 is the PLC control system schematic representation of embodiments of the invention 1;

Fig. 3 is the self-control expansion module structural representation of embodiments of the invention 1.

Embodiment

Embodiment 1:

The PLC control system of a kind of pitch-controlled system of present embodiment as shown in Figures 2 and 3, comprises the CPU module; Coder module, analog output module is equipped with the CAN communication module; The CPU module, coder module interconnects between analog output module and the CAN communication module; Also comprise the self-control expansion module; The self-control expansion module comprises the master chip module, photoelectric coupled circuit, discharge circuit, output transistor and CAN transceiver; The master chip module comprises master chip, and master chip is the LPC11C24 chip.Be integrated with DIM digital input module (DI) on the master chip, digital output module (DO), analog amount load module (AD) and CAN Interface Module (CAN); The input end of photoelectric coupled circuit is connected with the external digital load module, and the output terminal of photoelectric coupled circuit is connected with DIM digital input module; The input end of output transistor is connected with digital output module, and the output terminal of output transistor is connected with outside output circuit; External analog signal is connected with the analog amount load module through discharge circuit; The CAN Interface Module is connected with the CAN communication module through the CAN transceiver.The CAN transceiver adopts the CTM1050T module.

Present embodiment replaces original PLC expansion module with the self-control expansion module, and self-control expansion module and getting in touch through the CAN bus of PLC are realized, carry out the CANOPEN agreement between the two, and the self-control expansion module is as shown in Figure 3, and soft hardware equipment is following:

Hardware:

1. master chip: master chip adopts the LPC11C24 chip of NXP as kernel control chip, and the exploitation of CANOPEN communications protocol has been simplified in integrated CANopen driving among the ROM greatly in this chip slapper.This chip internal is a 50MHz Cortex-M0 arm processor, has guaranteed the Processing capacity of expansion module.

2. DIM digital input module (DI)/digital output module (DO): this module has the I/O function of digital quantity.Input realizes that by isolating optocoupler each input quantity can accomplish to isolate; Output quantity is realized by the output transistor of master chip control.

3. analog amount load module (AD): this module has the function of collection to analog amount.External analog signal is input to the analog amount load module (AD) of master chip after being handled by discharge circuit, thereby realizes the collection of signals such as temperature, voltage, electric current.

4.CAN Interface Module (CAN): because the inner integrated CAN controller of master chip LPC11C24, so need not to add control chip.The CAN transceiver adopts the CTM1050T module, this module integrated switch power, and insulating power supply, transceiving chip have greatly been simplified circuit design in one.

Software:

1) development environment: use the ARM Developer Suite (ADS) of ARM company, ripe version is ADS1.2.ADS1.2 supports all the ARM Series of MCU before the ARM10, and compilation, C, C++ source program are supported in support software debugging and the debugging of JTAG simulation hardware, has characteristics such as compile efficiency height, system library function are strong.

2) soft assorted framework: module signal is to external world constantly gathered, and every separated 50ms refreshes data, and PLC sends querying command to module, after module is received querying command, returns the required data of PLC.When PLC need export, by PLC module is sent output command, after module receives corresponding instruction, the signal that output is corresponding.

The DIM digital input module of present embodiment is gathered digital quantity, and the digital quantity of being gathered is through photoelectric coupled circuit input master chip, and master chip exports output quantity to digital output module through output transistor after handling.The analog amount load module is gathered analog amount, and the analog amount of being gathered is passed through discharge circuit and imported master chip, and master chip is realized communicating by letter through CAN Interface Module and CAN transceiver, and the CAN transceiver is through connecting getting in touch of realization of CAN communication module and PLC.

Present embodiment has proposed a kind of PLC expansion module replacement scheme; Main motion control still adds motion-control module by the CPU of PLC and realizes; General input and output point is then realized by the self-control expansion module; Realize information sharing and control through the CANOPEN agreement between them, reduced dependence fully, thereby the cost that reduces wind power pitch-controlled system does not lose reliability again PLC.

The present invention still has numerous embodiments, and all employing equivalents or equivalent transformation and the technological scheme of going that forms all drop within protection scope of the present invention.

Claims

1. the PLC control system of a pitch-controlled system comprises the CPU module, coder module; Analog output module is characterized in that: be equipped with a CAN communication module, said CPU module; Coder module is simulated between output module and the CAN communication module and is interconnected; Also comprise a self-control expansion module; Said self-control expansion module comprises the master chip module, photoelectric coupled circuit, discharge circuit, output transistor and CAN transceiver; Said master chip module comprises master chip, is integrated with DIM digital input module on the said master chip, digital output module, analog amount load module and CAN Interface Module; The input end of said photoelectric coupled circuit is connected with the external digital load module, and the output terminal of said photoelectric coupled circuit is connected with said DIM digital input module; The input end of said output transistor is connected with said digital output module, and the output terminal of said output transistor is connected with outside output circuit; External analog signal is connected with said analog amount load module through said discharge circuit; Said CAN Interface Module is connected with said CAN communication module through the CAN transceiver.

2. the PLC control system of pitch-controlled system according to claim 1, it is characterized in that: said master chip is the LPC11C24 chip.

3. the PLC control system of pitch-controlled system according to claim 1, it is characterized in that: said CAN transceiver is the CTM1050T module.