6FC3488-3EF-491229模块备件如何使用

5.3 子程序调用指令4.5.4 中断指令4.5.5 暂停指令4.5.6 结束指令4.5.7 顺控继电器指令（SCR）4.5.8 程序控制指令的应用小结题第5章 逻辑控制编程的编写方法5.1 顺序功能图5.1.1 顺序功能图的画法5.1.2 梯形图编程的原则5.2 逻辑控制实例38:延时接通/延时断开控制实例39:多个定时器组合实现长延时控制实例40:定时器和计数器组合实现长延时控制实例41:计数器串联组合实现时钟控制3.2.3 脉冲触发控制实例42:用微分操作指令实现脉冲触发实例43:用定时器实现周期脉冲触发控制实例44:用定时器实现脉宽可控的，一种是手持编程器，方便，我们实验室使用的就是手持编程PLC的定义有许多种。国际电工委员会（IEC）对PLC的控制器是一种数字运算操作的电子系统，专为在工业环境下应用而设计。它采用可编程序的存贮器，用来在其内部存贮执行逻辑运算、顺序控制、定时、计数和算术运算等操作的指令，并通过数字的、模拟的输入和输出，控制各种类型的机械或生产过程。可编程序控制器及其有关设备，都应按易于与工业控制系统形成一个整体，易于扩充其功能的原则设计。上世纪80年代至90年代中期，是PLC发展*快的时期，年增长率一直保持为30~40%。在这时期，PLC在处理模拟量能力、数字运算能力、人机接口能力和网络能力得到大幅度提高，PLC逐渐进入过程控制领域，在某些应用

5.3 subroutine call instruction 4.5.4 interrupt instruction 4.5.5 pause instruction 4.5.6 end instruction 4.5.7 sequence control relay instruction (SCR) 4.5.8 application summary of program control instructions Chapter 5 writing method of logic control programming 5.1 sequence function diagram 5.1.1 drawing method of sequence function diagram 5.1.2 principle of ladder programming 5.2 logic control example 38: delay on / delay off control example 39: multiple timer combination to realize long delay control example 40: timer and counter combination to realize long delay control example 41: counter series combination to realize clock control 3.2.3 pulse trigger control Example 42: using differential operation instruction to realize pulse triggering example 43: using timer to realize periodic pulse triggering control example 44: using timer to realize pulse triggering control with controllable pulse width 3.2.4 frequency division control example 45: two frequency division control 3.2.5 alarm control example 46: single fault alarm control example 47: multi fault alarm control 3.2.6 count control example 48: scanning count control example 49:6 digit count control example 3 Through the input interface circuit, the external switch signal is converted into a digital signal that can be accepted by the PLC. (2) The working process of the relay output interface circuit of the output interface PLC: when the internal circuit outputs digital signal 1, there is current flowing, and the relay coil has current, and then the normally open contact is closed to provide the current and voltage of load conduction. When the internal circuit outputs a digital signal of 0, no current flows, and there is no current in the relay coil, and th-speed pulse signals, such as a / D / a conversion module, high-speed counting module, etc. 4. Prograation in industrial environment. It adopts programmable memory, which is used to store and execute the instructions of logic operation, sequence control, timing, counting and arithmetic operation, and control various types of machinery or production processes through digital and analog input and output. The programmable controller and its related equipment shall be designed according to the principle that it is easy to form a whole with the industrial control system and expand its functions. From the 1980s to the mid-1990s, PLC developed rapidly, with an annual growth rate of 30-40%. During this period, the ability of PLC in processing analog quantity, digital operation, man-machine interface and network has been greatly improved, and PLC has gradually entered the field of process control, in some applications