FCP270Foxboro控制器卡件PLC模块卡件伺服控制器

　　fcp270 foxboro 控制器卡件 plc模块卡件 伺服控制器

　　fcp270 foxboro 控制器卡件 plc模块卡件 伺服控制器

　　fcp270 foxboro 控制器卡件 plc模块卡件 伺服控制器

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　　工控产品基本上都有

　　计算机中进行各种算术和逻辑运算操作的部件， 其中算术逻辑单元是中央处理核心的部分。

　　算术逻辑单元（alu）。算术逻辑单元是指能实现多组 算术运算与逻辑运算的组合逻辑电路，其是中央处理中的重要组成部分。算术逻辑单元的运算主要是进行二位元算术运算，如加法、减法、乘法。在运算过程中，算术逻辑单元主要是以计算机指令集中执行算术与逻辑操作，通常来说，alu能够发挥直接读入读出的作用，具体体现在处理器控制器、内存及输入输出设备等方面，输入输出是建立在总线的基础上实施。输入指令包含一 个指令字，其中包括操作码、格式码等。

　　（2）中间寄存器（ir）。其长度为 128 位，其通过操作数来决定实际长度。ir 在“进栈并取数”指令中发挥重要作用，在执行该指令过程中，将acc的内容发送于ir，之后将操作数取到acc，后将ir内容进栈。

　　（3）运算累加器（acc）。当前的寄存器一般都是单累加器，其长度为128位。对于acc来说，可以将它看成可变长的累加器。在叙述指令过程中，acc长度的表示一般都是将acs的值作为依据，而acs长度与 acc 长度有着直接联系，acs长度的加倍或减半也可以看作acc长度加倍或减半。

　　（4）描述字寄存器（dr）。其主要应用于存放与修改描述字中。dr的长度为64位，为了简化数据结构处理，使用描述字发挥重要作用。

　　（5）b寄存器。其在指令的修改中发挥重要作用，b 寄存器长度为32位，在修改地址过程中能保存地址修改量，主存地址只能用描述字进行修改。指向数组中的个元素就是描述字， 因此，访问数组中的其它元素应当需要用修改量。对于数组成来说，其是由大小一样的数据或者大小相同的元素组成的，且连续存储，常见的访问方式为向量描述字，因为向量描述字中的地址为字节地址，所以，在进行换算过程中，应当进行基本地址 的相加。对于换算工作来说，主要是由硬件自动实现，在这个过程中尤其要注意对齐，以免越出数组界限。

　　in a computer, a unit that performs various arithmetic and logical operations. the arithmetic logic unit is the core of the central processing unit.

　　arithmetic logic unit (alu). arithmetic logic unit (alu) is a combinational logic circuit that can realize multiple groups of arithmetic and logic operations. it is an important part of central processing. the arithmetic logic unit mainly performs binary arithmetic operations, such as addition, subtraction and multiplication. in the operation process, the arithmetic logic unit mainly executes arithmetic and logic operations with computer instructions. generally speaking, alu can play the role of direct read-in and read-out, which is embodied in the aspects of processor controller, memory and i / o equipment. the i / o is implemented based on the bus. the input instruction contains an instruction word, including operation code, format code, etc.

　　(2) intermediate register (ir). its length is 128 bits, which determines the actual length through the operand. ir plays an important role in the "stack and fetch" instruction. during the execution of the instruction, the contents of acc are sent to ir, and then the operands are fetched to acc, and then the ir contents are stacked.

　　(3) arithmetic accumulator (acc). current registers are generally single accumulators with a length of 128 bits. for acc, it can be regarded as a variable length accumulator. in the process of describing instructions, the expression of acc length is generally based on the value of acs, and acs length is directly related to acc length. doubling or halving of acs length can also be regarded as doubling or halving of acc length.

　　(4) deion word register (dr). it is mainly used to store and modify deion words. the length of dr is 64 bits. in order to simplify data structure processing, deion words play an important role.

　　(5) b register. it plays an important role in instruction modification. the length of b register is 32 bits. it can save the address modification amount in the process of address modification. the main memory address can only be modified with deion words. pointing to the first element in the array is the deor, so accessing other elements in the array should require a modifier. for the number composition, it is composed of data of the same size or elements of the same size and stored continuously. the common access method is the vector deion word. because the address in the vector deion word is a byte address, the basic address should be added first in the conversion process. for conversion, it is mainly realized automatically by hardware. in this process, special attention should be paid to alignment to avoid crossing the array boundary.