Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 103)

Manual/MDI Operation Modes
Chapter 4
4-11
This locates the machine home position. When the axis reaches this
position, the control resets the position registers to a machine coordinate
value specified in AMP. This establishes the zero point of the machine
coordinate system.
Important: During the machine home operation, softlimits and
programmable zones are not active. All active coordinates offsets are
cancelled.
In manual data input (MDI) mode, machine operations can be controlled
by entering program blocks directly by using the keys on the operator
panel.
To begin MDI operations, select MDI under <MODE SELECT> or press the
{FRONT PANEL}
softkey followed by the left and right cursor keys to select
the mode if not equipped with a mode select switch.
Important: If desired, your system installer has the option of disabling G-
or M-code AMP-defined paramacro calls in MDI mode. For details on
paramacros, refer to chapter 28.
To insert blocks in an active, executing, program by using MDI, the control
must be in the end of block state to allow the selection of MDI mode. If a
program is interrupted while executing in automatic mode by pressing
cycle stop, the control will not allow the selection of MDI since the control
is in cycle suspended state not end of block state, and a mode change is not
accepted.
CAUTION: When program blocks are executed in MDI, no
tool tip radius compensation (TTRC) is allowed. If TTRC was
previously active before the MDI blocks are executed, it is
temporarily canceled for the execution of the MDI blocks.
Refer to chapter 21 for details on the effect of MDI on TTRC.
Any TTRC G-codes that are programmed in MDI mode affect
the cutter compensation mode (G41, G42, or G40) when
compensation is re-activated.
Important: It is possible to call subprograms or paramacros within an
MDI program, however, there are limitations to the allowable commands.
Refer to chapter 28 on paramacros for details on illegal MDI commands
for these features.
4.5
MDI Mode