PLC control system, the content of the site software debugging experience

The PLC's internal curing a set of system software, initialized makes you start to work and the hardware configuration. PLC startup Settings, watchdog, interrupt Settings, communication Settings, the I/O module address identification is carried out in the PLC system software. Each has its own programming software as the application of PLC programming tool, the commonly used programming languages are ladder diagram language, there are ST, IL, and other languages. How to use the programming language for programming, here did not elaborate. But, in a programming language to write very optimization program, is the embodiment of the engineer programming level. Each PLC controller programming languages have their own characteristics, instruction design and arrangement of ideas. If a familiar with the instruction of PLC, can create very concise, elegant, smooth application. As a PLC, for example, as a program design, if the instructions are not familiar with programming engineers, programming skills also is bad, need 1000 statement; But a masterful skill programming engineers, may only need 200 statement can achieve the same function. Program is concise and can not only save the memory, the probability of error will be smaller, program execution speed is much faster, and, in the future also much easier to program changes and upgrades. Said so, although all the PLC ladder diagram logic are the same, as long as an engineer familiar with a kind of PLC programming, to learn the second brand of PLC can be very quickly. But the engineer in the use of a new PLC controller, or should the new PLC programming manual carefully seriously read it again, look at the instruction of special, especially their may use instructions, and to consider how to use the special way to optimize their own programs. Each instruction of PLC programming language design, interface design is different, there is no relative problems, mainly style is different. We can not arbitrarily said mitsubishi PLC programming languages as Siemens STEP7, also cannot say STEP7 is better than the ROCKWELL RSLOGIX, the so-called good or bad, the habit of programming in most is an engineer with the question of whether the design style of programming language used. The scene often need to modify procedures that have been programmed. Change may be the cause of the user's requirements change, could be found when the original programming mistake, or the PLC runtime power interruption happens, some state data will be lost, such as not to keep the timer will be reset, will refresh the input mapping area, the output mapping area may be zero, but the state file all configuration data and the cumulative value of accidental events such as the counter will be saved. Engineers at this time may need of PLC programming, make some memory can restore to the default state. The program does not need to be modified, can design the default way to restart the application, or using scanning a function for the first time. All intelligent I/O modules, including analog I/O module, after enter the programming mode or power interruption, data will be lost its configuration, the user program must confirm every time back into the run mode, the configuration data can be rewritten to intelligent I/O module. Modification has been running at the scene often overlooked one problem is that the engineer will forget to switch to the programming of PLC model, although this error is not hard to find, but when engineers in negligence, often mistakenly assume that PLC fault happened, thus causing the delay a lot of time. In addition, in the PLC program download, many power interruption of PLC is not allowed, because at that time, the old program has been rewritten part, but the new program and not completely finished, as a result, if the power supply, will cause the PLC can't run, then, may need to repack the underlying software of PLC, and many manufacturers in the field is not allowed in this operation. Most of the new PLC has separate user program and PLC system program, can avoid this problem.
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