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7) Cutter length compensation.
刀具长度补偿
This is similar to the preceding feature but applies to tool length and diameter.
这是类似上述的功能，但适用于刀具长度和直径。
In older-style controls, the cutter dimensions had to be set very precisely in order to agree with the tool path defined in the part program.
在老式的控制中，刀具尺寸设置非常精确，以完成在零件程序中刀具路径的定义。
Other methods for ensuring accurate tool path definition have been incorporated into newer CNC controls. One method involves manually entering the actual tool dimensions into the MCU.
确保刀具路径定义的其他方法已纳入新的数控系统。其中一种方法涉及到手动输入刀具的实际尺寸到MCU中。
These actual dimensions may differ from those originally programmed.
最初的编程时这些实际尺寸可能会有所不同。
Compensations are then automatically made in the computed tool path.
通过补偿，然后自动计算刀具路径。
Another more recent innovation is to use a tool length sensor built into the machine. In this method, the cutter is mounted in the spindle and brought into contact with the sensor to measure its length.
另一个更加新近的创新是使用机器内置的刀具长度传感器。在此方法中，刀具安装在主轴和传感器之间来测量其长度。
This measured value is then used to correct the programmed tool path.
然后用此测量值纠正编程路径。
8) Diagnostics.
诊断
Many modern CNC machines possess an no-line diagnostics capability which monitors certain aspects of the machine tool and MCU operation to detect malfunctions or signs of impending malfunctions.
许多现代的数控机床具有无线诊断监控机床某些方面的能力和通过MCU操作检测到故障或即将发生故障的迹象。
When a malfunction is detected, or measurements indicate that a breakdown is about to occur, a message is displayed on the controller’s CRT monitor. Depending on the seriousness of the malfunction, the system can be stopped or maintenance can be scheduled for a nonproduction shift.
当检测到故障，或测量表明即将发生故障时，控制器的CRT显示器上会显示一条消息。根据故障的严重性，该系统可以停止或维修，可定为非生产性转移。
Another use of the diagnostics capability is to help the repair crew determine the reason for a break down of the machine tool.
诊断能力的另一个用途是帮助维修人员确定机床出问题的原因。
One of the biggest problems when a machine failure occurs is often in diagnosing the reason for the breakdown.
一台机器发生故障时最大的难题经常就是如何诊断故障原因。
By monitoring and analyzing its own operation, the system can determine and communicate the reason for the failure.
系统可以通过自身的运行的监测和分析，判断和通报失败的原因。
9) Communications interface.
通讯接口
With the trend toward interfacing and networking in plants today, most modern CNC controllers are equipped with a standard communication interface to allow the particular machine tool to be linked to other computers and computer-driven devices.
在现时，树状网络中的网络接口和走向与趋势，最先进的CNC控制器配备了一个标准的通信接口，以允许特定的机床被其他计算机和计算机驱动装置。
