The basis of PLC technology progress ( Perform multitasking and swap)

The basis of PLC technology progress, mainly concentrated in two basic aspects: implement multitasking and procedures. Means that there is more tasks in a PLC controller system can pack several CPU module at the same time, each CPU module to perform a particular task, control its access to perform tasks related to I/O module. In fact, according to the IEC61131 - Three concepts, we should be more accurately called by multiple configuration more missions. Most of mitsubishi electric, for example, small Q series can be inserted in a rack four CPU module; Fuji electric MICREX - SX series up to 6 CPU module is inserted in a rack. The CPU module can be used exclusively for logic control, sequence control, also can is motion control, can also be used for process control, the above under the environment of the Windows operating system performs the task of the PC module, is also an option for users to choose. In a sense, this also is a kind of hybrid control systems. Traditional PLC software model including a resource, run a task, to control a program, and run in a closed system. The IEC61131 - 3 PLC programming language standard software model, in its most upper the complete software to solve the problem of a specific control summed up as a 'configuration'. It points to a specific type of control system, including hardware equipment, processing resources, the I/O channel storage address and system capacity, equivalent to an application of PLC system. In a composed of many sets of PLC or by multiple cpus in the PLC control system, each application of PLC or each CPU is an independent 'configuration'. In a 'configuration' can define one or more of the 'resource'. Can see 'resource' as can implement IEC procedures, it reflects the physical structure of PLC, the PLC program and the physical I/O provides an interface between channels. Only after loaded into a 'resource' to implement IEC procedures. In general, the resource is placed within the PLC, usually, of course, it can also be put inside other support IEC program execution system. Within a 'resource' can define one or more tasks. After the task is configured can control a set of procedure or function block. To perform these procedures and function block can be cycle, enforce can also be driven by an event. Enough to image the software model, therefore, various kinds of actual system: for only a small processor system, the model is only one configuration, a resource and a program, and now most of the PLC is completely consistent. Have multiple CPU module for instrumentation, large system, in the same frame on each CPU module is seen as a configuration, can be made of one or more resources to describe, whereas a resource includes one or more programs. For distributed systems, including multiple configuration, and a configuration that contains multiple processors, each processing USES a resource description, and each resource is include one or more procedures. Is noted, became popular in Japan in recent years many CPU structure of PLC, exactly is the IEC61131 - Available only after years of after 3 standards promulgated. Revolutionary change of the structure, the PLC is clearly based on the theory of the software model, or by a CPU or PLC according to scanning methods of the traditional structure of executing a program. As to the problem of swap program, at least so far is still a hard direction. Only at each PLC controller PLC products provided by the supplier are really follow IEC61131 - 3 standard, and its concrete implementation of programming system to conform to the IEC61131 - again 8 'guide for the application and implementation of programming language, and through the PLCopen the international organizations for a variety of programming language ( LD, SFC, FBD, ST and IL) Consistency test, and solve different PLC corresponding swaps, store address resources is likely to realize the real exchange program.
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