Emerson 5X00594G01 以太网远程序不仅要正确，还要可靠。可靠反映着PLC程序的稳定性，这也是对PLC程序的基本要求。有的PLC程序，在正常的工作条件下或合法操作时能正确工作，而出现非正常工作条件(如临时停电，又很快再通电)或进行非法操作(如一些按钮不按顺序按，或同时按若干按钮)后，程序就不能正常工作了。这种程序，就不大可靠，或说不稳定，就是不好的程序。好的PLC程序对非正常工作条件出现，能予以识别，并能使其与正常条件衔接，可使程序适应于多种情况。好的PLC程序对非法操作能予以拒绝，且不留下“痕迹”。只接受合法操作。联锁是拒绝非法操作常用的手段，继电电路常用这个方法，PLC也可继承这个方法。
5X00594G01
5X00594G01 以太网远程序简短可以节省程序运行时间，但简短与省时并不完全是一回事。因为运行程序时间虽与程序所拥有指令条数有关，而且还与所使用的是什么指令有关。PLC指令不同，执行的时间也不同。而且，有的指令，在逻辑条件ON时执行与在OFF时执行其时间也不同。另外，由于使用了流程控制指令，在程序中，不是所有指令都要执行等。所以，运行程序的时间计算是较复杂的。但要求其平均时间少，大时间也不太长是必要的。这样可提高PLC的响应速度。省时的关键是用好流程控制指令。按情况确定一些必须执行的指令，作必备部分，其余的可依程序进行，有选择地执行，或作些分时工作的设计，避免大时间太长等。
5X00594G01
Emerson 5X00594G01 Ethernet remote program not only needs to be correct, but also reliable. Reliability reflects the stability of PLC programs, which is also a basic requirement for PLC programs. Some PLC programs can work correctly under normal working conditions or legal operations, but after abnormal working conditions (such as temporary power outage and quick re energization) or illegal operations (such as some buttons not being pressed in sequence or multiple buttons being pressed simultaneously) occur, the program cannot work properly. This type of program is not reliable, or unstable, it is a bad program. A good PLC program can identify abnormal working conditions and connect them with normal conditions, making the program adaptable to various situations. A good PLC program can reject illegal operations without leaving any “traces”. Only accept legal operations. Interlocking is a common means of rejecting illegal operations, which is commonly used in relay circuits and can also be inherited by PLCs.
5X00594G01
The brevity of 5X00594G01 Ethernet remote program can save program running time, but brevity and time saving are not completely the same thing. Because the running time of a program is not only related to the number of instructions the program has, but also to what instructions are used. The execution time varies depending on the PLC instructions. Moreover, some instructions are executed at different times when the logical condition is ON and when it is OFF. Additionally, due to the use of process control instructions, not all instructions need to be executed in the program. So, calculating the time to run a program is relatively complex. But it is necessary to require that the average time is small and the large time is not too long. This can improve the response speed of the PLC. The key to saving time is to use process control instructions well. Determine some instructions that must be executed according to the situation, make necessary parts, and the rest can be executed selectively according to the program, or design some time sharing work to avoid large time and too long.
5X00594G01
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