Restarting after a stop DNC Drip Feeding via HyperTerminal is it possible?

[Rocko1]

Setting 36, Program Restart can this be used when drip feeding using hyperterminal? Thanks

[gar]

070911-1906 EST USA

Rocko1:

What do you mean by stopping?

If you turn power off, or do a reset you will have terminated the drip feed reception. This may or may not have stopped the sending source. You would have to start over. What most users do if they are far into the program is edit a copy of the program so as to start somewhere near where the interruption took place.

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[Geof]

Here is the description of Program Restart from the Haas Manual:

36 Program Restart
When this setting is ON, restarting a program from a point other than the beginning will direct the control to scan the entire program to ensure that the tools, offsets, G and M codes, and axis positions are set correctly before the program starts at the block where the cursor is positioned.

When it is Off the program will start without checking the conditions of the machine. Having this setting Off may save time when running a proven program.

A program running by DNC does not reside in the machine memory so I don't see how the controller could scan through it to perform a Program Restart in this manner.

[gar]

070912-1707 EST USA

Rocko1:

Suppose you are drip feeding and a tool breaks.

If your machine has the capability in FEED HOLD to stop the spindle move the head and table, change the tool, reset tool offset, and then push START and go back to executing the program from where you did the FEED HOLD, then I would expect you could restart in drip mode because this implies you did not break the communication link and the program pointer is pointing to the next instruction in the program.

None of our machines have this capability.

Geof's comments are correct for the case of a broken communication link. Consider this: the HAAS restart described by Geof requires you to put the program pointer (in this case using the cursor) at the restart point, this implies the program is in HAAS memory so that you can move the cursor to the start point. If HAAS provided some means other than the cursor to point to the start point, then with appropriate design you would be able to do a HAAS type restart.

An easy way to design such a capability would be to use line numbers to define restart points. In general you want to eliminate line numbers in large programs that are drip fed, but one could spread these every 100 to 1000 lines of code.

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