厦门仲鑫达自动化设备有限公司

；（陈工）

;

厦门市思明区湖滨东路湖光大厦8楼A座
  (3)数据寄存器(D)的当前值；
(4) FX1N的特殊单元和特殊模块中的缓冲寄存器；
    (5)PLC出现错误时，可显示错误代码；
    (6)显示实时钟的当前值，并能设置日期和时间。
    FX1N–5DM可将位编程元件Y，M，s强制设置为ON或OFF状态。可改变T，C和D的当前值，以及T和C的设定值，可设备的监控功能。
  2．显示模块FX-10DM-E
    FX-10DM-E可安装在面板上，用电缆与PLC相连，有5个键和带背光的LED显示器，可显示两行数据，每行16个字符，可用于各种型号的FX系列PLC。可监视和修改T，C的当前值和设定值，监视和修改D的当前值。连接图和PLC外围电气线路图组成系统的电气原理图。到此为止系统的硬件电气线路已经确定。
 
    （五）程序设计  
    1.程序设计  
    根据系统的控制要求，采用合适的设计方法来设计PLC程序。程序要以满足系统控制要求为主线，逐一编写实现各控制功能或各子任务的程序，逐步完善系统的功能。除此之外，程序通常还应包括以下内容：  
    1）初始化程序。在PLC上电后，一般都要做一些初始化的操作，为启动作必要的准备，避免系统发生误动作。初始化程序的主要内容有：对某些数据区、计数器等进行清零，对某些数据区所需数据进行恢复，对某些继电器进行置位或复位，对某些初始状态进行显示等等。  新阶段。程序执行阶段的运算结果被存入输出映像区，而不送到输出端口上。在输出刷新阶段，PLC将输出映像区中的输出变量送入输出锁存器，然后由锁存器通过输出模块产生本周期的控制输出。如果内部输出继电器的状态为“1”，则输出继电器触点闭合，经过输出端子驱动外部负载。全部输出设备的状态要保持一个扫描周期。

l        TAR1    将地址寄存器1的内容传输到累加器1

l        TAR2    将地址寄存器1的内容传输到累加器2

l        CAR    交换地址寄存器的1的内容和地址寄存器2的内容交换

（Ⅲ）处理通讯请求：S7-200执行通讯处理。

（Ⅳ）执行CPU自诊断：S7-200检查固件、程序存储

器和扩展模块是否工作正常
=，在执行输出指令时，映像寄存器中的参数位被接通。 
四、置位与复位指令S、R 
S，执行置位(置1)指令时，从bit或OUT的地址参数开始的N个点都被置位。
R，执行复位(置0)指令时，从bit或OUT的地址参数开始的N个点都被复位。
置位与复位的点数可以是1-255，当用复位指令时，如果bit或OUT的是T或C时，那么定时器或计数器被复位，同时当前值将被清零。 
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