- A number assigned to peripheral units during autoload or system generation time. Such numbers can be altered whenever convenient, in contrast to a physical unitnumber. Forexample, a tape unit may be assigned logical unit number 5 and a read operation from unit 5 will result in reading a tape.; 在自动装入或系统生成时,一种分配给外部设备的编号。这样的编号在任何方便的时候都 可以变换,只要与物理设备号相对应就可以。例如,一磁带机可以分配为逻辑设备号5,那么, 从设备5的读操作将导致读带。
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