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Figure 2. A Typical CNC Interface.
Cycle Finish
If your application is in an automatic machine, such as a CNC mill, the feedback lines (pins 1 and 2) should be
utilized. Pins 1 and 2 are connected to the contacts of a relay inside the control and have no polarity or power
on them. They are used to synchronize the automatic equipment with the controller
The feedback lines provide a switch closure through a relay inside the Haas control box to let your machine
know when the table has finished indexing. The relay can be used to “Feed Hold” NC machine movements or it
can be used to cancel the M function. If your machine is not equipped with such an option, another alternative
may be to dwell for a period of time longer than it takes the control to index the head. The relay will trigger for
all cycle start closures except a no-operation code of 97.
Summary of Contents for HRT 160
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