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38
January 2004
DNC (D
IRECT
N
UMERICAL
C
ONTROL
)
MODE
MDI/DNC
If you wish to enable DNC, turn on Setting 55, and then a second press of MDI/DNC will
select Direct Numerical Control mode on the machine. The bit ENABLE DNC in parameter
57 must also be on with a 1, to be able to select DNC.
DNC capability is a standard feature on a Haas machine. With DNC, there is no limit to the size of your CNC
programs. The programs are directly executed by the control as they are sent over the RS-232 interface. Note
that this is the first serial port or the top connector on the back of machine. Do not confuse DNC with RS-232
uploading and downloading.
NOTE
: Floppy disk DNC is selected by entering the floppy disk file name and pressing
MDI a second time when already in MDI mode. Do not press MDI
three
consecutive times or a DISK ABORT will result.
When enabled, DNC is selected by pressing MDI a second time when already in MDI. DNC mode will not be
enabled unless there is a minimum of 512 bytes of user memory available. When DNC is selected, the
PROGRAM DISPLAY will show:
WAITING FOR DNC...
This means that no DNC data has been received yet and you may begin sending data. You must start sending
the program to the control before the CYCLE START button can be pushed. After the beginning of the program
is seen by the control, the display will show part of the program and a message at the bottom, left of the CRT
will show DNC PROG FOUND. After the program is found, you may push CYCLE START just like running any
other program from Memory.
If you try to press CYCLE START before receiving a program, you will get the message: NO DNC PROG YET.
The reason for not allowing CYCLE START command before receiving the DNC program is safety. If the opera-
tion is allowed to start from a remote location, the operator may not be present to ensure that the machine is
operating safely.
While a DNC program is executing, you are not allowed to change modes. You must first press RESET to stop
the program.
When the end of the DNC program is received, the message DNC END FOUND is displayed. When the DNC
program is finished running, the PROGRAM DISPLAY will show the last few lines of the program. You must
press RESET or exit the DNC mode before you can run any other programs. If you try to press CYCLE START
before RESET of the previous DNC, you will get the message: RESET FIRST.
DNC supports Drip mode. The control will execute one block at a time from the RS-232 port. Each block
entered will be executed immediately with no block look-ahead buffering. The exception is that Cutter Compen-
sation requires three blocks of motion commands to be buffered prior to a compensated block being executed.
There are certain restrictions on what can be in a DNC program. Canned cycles G70, G71, G72, and G73
cannot be programmed while in DNC, since they require the control to look ahead.
Summary of Contents for EC Series
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