Siemens SINUMERIK 840C - Manual (Page 1016)

12.93 12 Functional Descriptions
12.23.2 Reference systems
Diagram showing reference systems
-150
900
M - Machine reference point (coordinates: X
M
and Y
M
)
W1 - Workpiece reference point (coordinates: X
W1
and Y
W1
)
W2 - Workpiece reference point (coordinates: X
W2
and Y
W2
)
Y
M
400
X
M
X
W1
W1
X
W2
100
G54
250
P
XW1
(250)
500
P
YW2
(-300)
Y
W2 P
XW2
(-400)
G55 Y
W1
M
P
YW1
(250)
P
W2
12.23.3 Functional description
The "Actual-value system for workpiece" function can be parameterized via setting and
machine data. The function is activated with SD 5001 bit 0 = 1.
The actual-value system for workpiece function has the following features:
• The basic setting of the valid ZOs (G54 - G57) and TOs (D0 - 819) after power on are
defined in MD 140* and 142* on a channel-specific basis.
• After NC start, MD 110*, 112* and D0 are selected as standard. If MD 5153.1 = 1, then
the last selected ZO group, TO and level remain active even after NC start.
• The actual values for all axes of the active channel are displayed according to the sum of
all ZOs and the active TO.
• In this case, the reference system-based display of axis positions is implemented such that
the actual values of all axes are displayed independently of any programmed axis motion
after the ZO or TO has been changed. This also applies to the "Workpiece-related reading
of actual values" function (@ 360).
© Siemens AG 1992 All Rights Reserved 6FC5197- AA50 12–241
SINUMERIK 840C (IA)