As any processor has a fixed set of registers, there is a limit to the number of variables that can be kept in registers at any one point in the program.
寄存器的数量在每个处理器当中都是固定的，所以在程序的某个特定的位置，可以保存在寄存器中的变量的数量是有限制的。
Via reading system variables fixed point of axes can be determined in machine coordinates system: Via reading system variables PLC state bit is condition of criterion as NC macro-program goto;
通过读取系统变量可以灵活地确定每一个轴在机床坐标系中的固定点；通过读取系统变量将PLC状态位作为NC宏程序跳转的判断条件；
Via reading system variables fixed point of axes can be determined in machine coordinates system: Via reading system variables PLC state bit is condition of criterion as NC macro-program goto;
通过读取系统变量可以灵活地确定每一个轴在机床坐标系中的固定点；通过读取系统变量将PLC状态位作为NC宏程序跳转的判断条件；
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