
15. PMC CONTROL FUNCTION
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A program number (1 to 9999) is specified from the outside and is selected
in the CNC memory.
For machines that can load several kinds of workpieces, this function can
automatically select for execution the program corresponding to a
specific workpiece.
Data for the external program number search is accepted regardless of the
mode, but the search execution can be made only in the reset state in MEM
mode.
The ESEND signal switches from “0” to “1” at the end of the external
program number search. This signal does not turn to “0” unless the cycle
start or reset signal is input, or another search is made. Use ESEND to
make a cycle start signal after the search.
NOTE
1 The external program number search is valid when
parameter ESR no. 6300#4=1.
2 The reset state is when the automatic operation lamp is off.
If the start button is pushed in the cycle operation stop or
hold state, search execution starts from the actual position
indicated by the pointer.
3 When there is not a program stored in memory
corresponding to the set program number, P/S alarm no. 59
will be activated.
4 Program search is not made if the program number is set to
“0”. When the start button is pushed, execution starts from
the position indicated by the pointer, instead.
These signals provide for changing the tool compensation amount via the
PMC. When the offset number is specified by a program, data input from
the PMC is added to the offset amount. The offset amount can also be used
as input data itself by specifying the input signal.
When the machine tool is equipped with automatic tools or workpiece
measuring functions, the offset amount can be corrected using this
function, by inputting the error from the correct value into the CNC via
PMC.
If the tool compensation amount is externally input when offset number
0 is specified in a program (a offset cancel) in T series, the workpiece
coordinate system shifts by the entered quantity. The external tool
compensation amount is 0 - "7.999mm or "0.7999 inch at a time.
1) External Program
Number Search
2) External tool
compensation