Embedded PLC-- Embedded Type PLC_4526-Vibram-Tods

Embedded PLC?? Embedded Type PLC
Abstract: Based on the classical controller inquiry, the concept of embedded PLC, opener to EASYV1.00 embedded PLC software kernel structure for the basic analysis to adviser the industrial designer to create a fashionable embedded system design.
Keywords: Embedded PLC core CAN bus

Abstract: Bytheanalysisoftheclassicalcontroller, theconceptionofembeddedPLCisproposed.Theemphasesis toleadthedesignersofthecontrollingengineeringtobui ldanewnotionofthedesignofembeddedsystembythebasica nalysisofthekernelconfigurationoftheEASYV1.00embed dedPLCsoftware. Keyword: EmbededPLCKernelCANbus [CLC] TP23 [Document code] A Article ID 1606-5123 (2005) 11-00
1 Introduction: the notion of embedded PLC

Embedded PLC refers to a control apparatus to accomplish a characteristic PLC (ProgramableLogicController) ladder programming language interpretation, implementation, so namely a particular device has its own special features based on the basic functions of PLC.
Ladder is an engineer for the factory automation, graphical PLC Programming Language. Ladder with easy, intuitive, process-oriented, and numerous other advantages. PLC programming language to control the emergence of the hardware device management and control processes for the separation, PLC manufacturers to focus on hardware and hardware management, factory automation personnel using ladder language for secondary development, so the same applies to the alter control PLC system, the formation of a programmable logic controller (PLC) of this platform-level products.
But the control of production devise has developed into a pursuance of personalized, distinguished design stage. Conventional PLC {can|be able apt,0} not enter the mall, constantly face more of a personalized, differentiated pressure. Such like,0 price control, and particular,0 functions. Emergence of industrial calculator (IPC), microcontroller, embedded boards closer to the individual needs of the control products. IPC in the interconnect, the statement of the algorithm so obvious conveniences in cost control MCU system more amenable. IPC The loading of the operating system (such as NT) when in fact,Tods Cap-Toe, permanence namely complicated to meet the demanding requirements of continuous control, normally accustomed for monitoring. Lower usually PLC. SCM system, the hardware management and consumer control of mixing process, restricting its standardization, and ultimately wastage of cost competitiveness.
Is embedded PLC and computer systems development for the IPC, which maintained the PLC (with ladder language) hardware management and process control advantages of separation, combined with IPC and single chip to provide a more personalized and differentiated designs method to form a new controller design. When we IPC embedded PLC functionality, we call on PCBase embedded PLC, when we embedded PLC functionality in SCM, we call on AllONOne embedded PLC (chip-level embedded PLC). When not specified, refers to film-level Embedded Embedded PLC PLC, which is intended in this paper an embedded PLC. The retinue specification of an 8-bit microcontroller C8051F040 to Kuwait for the hardware companies EASYV1.00 Edition Embedded PLC software architecture.
Currently, there are soft on the special PLC PLC PLC and 2 traveler criterion. Soft PLC refers to high-end general-purpose real-time embedded operating system with PLC software, customer-standard PLC is designed according to user needs orientation PLC. Related technology in Germany, Taiwan, South Korea had breakthrough areas are embedded PLC.
2 Embedded PLC software building 2.1 overall structure EASYV1.00 embedded PLC is a powerful real-time operating system software, the structure consists of 3 levels, shown in Figure 1.
(1) Embedded PLC kernel real-time task scheduling is completed, ladder language interpretation, implementation, communication and additional basic functions, and cater secondary development-driven interface;
(2) secondary development procedure provided through the core plug-task, using a kind of kernel development for individual differences in the specific object of the driver;
(3) termination for process control applications that the ladder language programming;

The overall architecture of Figure 1EASYV1.00

Developers for the second thing for the individual driver, must know the Embedded PLC kernel structure, particularly,0 the steer interface design manner,0, the emulating stop describes the kernel of the block function.
2.2 Real-Time OS For small microcontroller, real-time operating systems generally can not be fraught, OS / take up much too,0 resources, EASYV1.00 essence according to the type of task, real-time requirements, customized a special real-time OS, it is no documentation system and memories management in two chapters.
(1) hard real-time concurrency under the preemptive task management

EASYV1.00 kernel benchmarks provide 2.5ms time base, it can not be deprived of the task as a loop for the various tasks of monitoring and management.
For industrial applications with asynchronous accidents concurrent task management, through manifold interrupt preemption task hangs, execution, execution of every,0 type of asynchronous task before the task in the 2.5ms of registration, afterward the cancellation, by 2.5ms Time-based vehicle monitoring and blocking concurrent tasks and report status of the word to the afterward level task scheduling.
(2) EASYV1.00 the asynchronous task

Communication file correlate wafer of the byte stream contact

Ladder language Timer ? Secondary development in the driver's real-time asynchronous tasks

Concurrent task management is EASYV1.00 the lowest class of task management, to ms-level real-time effects, per element period (1ms) CPU-machine peak:
T and = Ni?? 1ms highest number of times within the task, ti?? An implementation of the maximum time the task.
EASYV1.00 concurrent tasks real-time data in Table 1, Table 2.

Table 1EASYV1.00 concurrent tasks real-time data

Task category inalienable task of the task communication byte flow simultaneous tasks ladder timer driver

2.5ms time base reg code port 0 reg code 1CAN

Number of times (N1) 11111ND Executiin due time (T) 10 s + T25 s25 s50 s40 stD

Table 2EASYV1.00 concurrent tasks real-time data

Task type ladder communication function phone the user software interrupt Number of 131m4

tasks Task time 1-20 s1-10 s1-5 st4

T membrane = 3-45 s + t4
T
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