1756-L63 中央控制器

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1756-L63 （控制器）分组合逻辑控制器和微程序控制器，两种控制器各有长处和短处。组合逻辑控制器设计麻烦，结构复杂，一旦设计完成，就不能再修改或扩充，但它的速度快。微程序控制器设计方便，结构简单，修改或扩充都方便，修改一条机器指令的功能，只需重编所对应的微程序；要增加一条机器指令，只需在控制存储器中增加一段微程序，但是，它是通过执行一段微程。具体对比如下：组合逻辑控制器又称硬布线控制器，由逻辑电路构成，完全靠硬件来实现指令的功能。

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1756-L63 中央控制器

1756-L63 （控制器）是机器的核心。

标准定义为：按照预定顺序改变主电路或控制电路的接线和改变电路中电阻值来控制电动机的启动、调速、制动和反向的主令装置。由程序计数器、指令寄存器、指令译码器、时序产生器和操作控制器组成，它是发布命令的“决策机构”，即完成协调和指挥整个计算机系统的操作。电力是其应用的学科，配电与用电为二级学科。
1756-L63 （控制器）分组合逻辑控制器和微程序控制器，两种控制器各有长处和短处。组合逻辑控制器设计麻烦，结构复杂，一旦设计完成，就不能再修改或扩充，但它的速度快。微程序控制器设计方便，结构简单，修改或扩充都方便，修改一条机器指令的功能，只需重编所对应的微程序；要增加一条机器指令，只需在控制存储器中增加一段微程序，但是，它是通过执行一段微程。具体对比如下：组合逻辑控制器又称硬布线控制器，由逻辑电路构成，完全靠硬件来实现指令的功能。

The 1756-L63 (controller) is the heart of the machine. The standard definition is: a master device that controls the starting, speed control, braking, and reversing of a motor by changing the wiring of the main or control circuits in a predetermined sequence and by changing the value of the resistance in the circuits. By the program counter, instruction register, instruction decoder, timing generator and operation controller, it is the “decision-making body” to issue orders, that is, to complete the coordination and command the operation of the entire computer system. Electricity is the ** subject of its application, and power distribution and use of electricity are secondary subjects.
1756-L63 (controller) combined logic controller and microprogram controller, the two kinds of controllers have their own strengths and weaknesses. Combination logic controller design trouble, complex structure, once the design is completed, it can not be modified or expanded, but it is fast. Microprogram controller design is convenient, simple structure, modification or expansion are convenient, modify the function of a machine instruction, only need to reprogram the corresponding microprogram; to increase a machine instruction, only need to add a section of the control memory microprogram, but it is through the execution of a section of the microprogram. Specific comparisons are as follows: combinational logic controllers, also known as hard-wired controllers, are composed of logic circuits and rely entirely on hardware to realize the function of the instruction.