Rockwell Automation 8520-ARM2 9/Series CNC AMP Reference Manual Documentation Set - Manual (Page 127)

Chapter
6
6-1
Zone/Overtravel Parameters
Zones and overtravels define areas that restrict the movable range of the
cutting tool. The control is equipped to establish two overtravel areas and
two programmable zones.
There are two types of overtravel:
Hardware overtravels ---- Established by mounting mechanical limit
switches on the movable range of the axes (see documentation prepared
by the system installer).
Software overtravels ---- Established in AMP by assigning coordinate
values in the machine coordinate system that the axes may not exceed.
There are two types of programmable zones:
Programmable Zone 2 ---- Is established either on the control or in AMP
by assigning coordinate values in the machine coordinate system that
define an area that the axes may not enter. Programmable zones may be
turned on and off in a part program.
Programmable Zone 3 ---- Is established either on the control or in AMP
by assigning coordinate values in the machine coordinate system that
define an area that the axes may not enter or the axis may not exit
(depending on the location of the axis when the zone is activated).
These values may also be assigned through programming.
Programmable zones may be turned on and off in a part program.
Zones are meant to be less permanent than overtravels and prohibit axis
movement into machine attachments. On a lathe, you might set up a zone
to protect the lathe chuck. Overtravels are usually used to prohibit axis
motion from exceeding the physical travel limits of the machine.
In Dual Process controls, interference checking parameters are used to
prevent axes from colliding with each other.
ATTENTION: The programmable zones and software
overtravels do not take into consideration the tool length or
radius of the tool that might currently be installed in the
machine. These zones respect only the axis position in the
machine coordinate system.
6.0
Chapter Overview