
2. BASIC KNOWLEDGE B-63214EN/01
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2.1 DNC Operation
This section provides the basics of DNC operation.
In ordinary DNC operation, a CNC operates directly based on NC programs
loaded into it from an external device such as a reader/puncher interface,
remote buffer, or data server. With DNC Operation Management Package,
NC programs can be stored on the personal computer hard disk for an open
CNC, then sent directly from the personal computer to the CNC.
There are two DNC operation modes, described below. Both are supported
by this software.
• Scheduled operation
NC programs should be stored on the personal computer in advance. The
name and the repeat count of each NC program that will be executed
should be listed in a schedule file. When a cycle start is performed for
the NC, a program supply request is sent to the personal computer. In
response, the personal computer sends the specified NC programs to the
NC in succession.
• Subprogram call operation
Main programs and subprograms should be stored in advance on the NC
and personal computer, respectively. During NC memory operation,
when subprogram call block M198Pxxxx is executed, a program supply
request is sent to the personal computer. In response, the personal
computer sends subprogram xxxx.TXT to the NC.