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C 2)
Address allocation
for PLC-markers
C 2.1)
User markers: Address letter M
Address
Description
M 0 - M 999
User markers
which
are available for use iand are reset after powering
up
M 1000 - M 1999
User markers
which
are available for use and remain unchanged
in memory
after a power
interruption.
These markers
remain unaffected
after powering
up.
C 2.2)
Markers for the signal exchanges between PLC and NC: Address letter M
Address
Description
M 2000 - M 2447
Markers
for signals from the NC to the PLC (NC-cPLC).
M 2448 - M 3023
Markers
for signals from the PLC to the NC (PLC-NC).
C 2.2.1)
Markers for the axis release: X, Y, 2, IV
Marker No.
Function
2000
Axis release X
2001
Axis release Y
2002
Axis release Z
2003
Axis release IV
Signal dhection
NC -PL.C
The markers
for the axis release are set by the NC-part
as follovls:
Switch
on control:
Cancel error message
POWER
INTERRUPTED
Switch
on control
vohage
Dialogue
display:
PASS OVER X/Y/Z/IV-REFERENCE
MARK
+
Start the reference
mark iraverse
of
the first axis (e.g. Z-axis):
the axis release marker
for this axis
will be automatically
set by the NC-part
of the control.
Start the reference
mark traverse
of the second axis (e.g. Y-axis):
the axis release marker
for this axis will be automatically
set
by the NC-part
of the control
I
ek.
The axis release markers
remain set to "1" after traversing
over the reference
marks,
thus keeping
the machine
axes in closed positioning
loop through
the control.
Exception:
The axis release markers
are reset should
a position
loop be inhibited
by the IPLC-part
(e.g. in order to
clamp an axis, see section
C 2.2.13).
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