Siemens SINUMERIK 840D sl Function Manual page 1518

Detailed description
2.12 Block descriptions
Flexible axis configuration
It is possible to be flexible in the assignment of axis selections or direction keys for machine
axis numbers.
Better support is now provided by the MCP blocks for the use of two MCPs, which are to run
in parallel, in particular for an application using two channels and two mode groups. Note
that the axis-numbers are also specified in the parameterized mode group number of the
MCP block in the axis tables of the relevant MCP.
For this flexibility there are tables for axis numbers in DB 10.
For the 1. Machine control panel (MCP) the table starts from the byte 8
(symbolic name: MCP1AxisTbl[1..22]) and
for the 2. Machine control panel (MCP) the table starts from the byte 32
(symbolic name: MCP2AxisTbl[1..22]) for the second MCP. The machine axis numbers must
be entered byte by byte here.
It is permissible to enter a value of 0 in the axis table. Checks are not made to find
impermissible axis numbers, meaning that false entries can lead to a PLC Stop.
The restriction of the number of axes at FC 26 is done via the 0-values in the axis table. The
axis numbers can also be adapted dynamically. Axis numbers may not be switched over
while the axes are being traversed via the relevant direction keys.
The compatibility mode is preset with axis numbers 1 to 6 for both MCPs and restricted to
the configured number of axes.
Note
With FC26 (HT8) there is a deviation from other MCP blocks
FC19, FC24, FC25 in the selected workpiece coordination system (WCS).
Here the first 3 traversing keys have an effect on the channel axes (WCS axes). The
following traversing keys act on the machine axes in accordance with the axis numbers
allocated from the axis tables. These are by default the machine axes 4 to 6. Wiring of output
byte 3, bit 7 to 1 on the MCP outputs (parameter "MCP1Out" or "MCP2OUT") permits only
the channel axes to be traversed when WCS is activated.
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Basic logic functions: PLC basic program solution line (P3 sl)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0