Siemens SINUMERIK 840Di Function Manual page 1156

Detailed description
2.12 Block descriptions
In the case of a failure of the MCP, the signals it supplies are set to zero.
With SW V4 and higher, multiple calls of FC 19 or FC 25 are permitted within the same PLC
cycle. In this case, the first call in the cycle drives the LED displays. Moreover, all actions of
the parameterized block are performed in the first call. In the following calls, only a reduced
level of processing of the channel and mode group interface takes place. The geometry axes
are supplied with directional data only in the first block call in the cycle.
The second machine control panel can be processed if parameter ModeGroupNo has been
increased by B#16#10. When parameterizing, the HHU number is contained in the lower
nibble (lower 4 bits).
BAGNo = 0 or B#16#10 means that the mode group signals are not processed.
ChanNo = 0 means that the channel signals are not processed.
With SW 5 and higher, the INC selections of the override switch are only transferred to the
BAG group. This results in runtime improvements. The activation for this command is
performed by this block once after powerup via DB10.DBX 57.0. 2 MCPs can still be handled
in parallel by this module. The module 2 call for the 2nd machine control panel in OB1 cycle
must come after the call of the 1st MCP. Support for of two MCPs is still provided within
certain restrictions in the control panel blocks (the standard software does not support axis
numbers 10 to 31, mutual interlocking of axis with two MCPs).
Flexible axis configuration
With SW V6 and higher, it is possible to be flexible in the assignment of axis selections or
direction keys of machine axis numbers.
Better support is now provided by the MCP blocks for use of two MCPs, which are operated
simultaneously, 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.
To afford this flexibility, tables for axis numbers are stored in DB 10. The table starts from
byte 8 (symbolic name: MCP1AxisTbl[1..22]) for the first machine control panel (MCP) and
from 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.
For FC 19, the maximum possible number of axis selections can also be restricted. This limit
is set for the appropriate MCP in DB10.DBW30 (symbolic name: MCP1MaxAxis) or
DB10.DBW54 (symbolic name: MCP2MaxAxis). The default setting is 0, corresponding to
the maximum number of configured axes. The axis numbers and the limit can also be
adapted dynamically. Afterwards, a new axis must be selected on FC 19.
Axis numbers may not be switched over while the axes are traversing the relevant direction
keys.
The compatibility mode is preset with axis numbers 1 to 9 for both MCPs and the restriction
for the configured number of axes.
2-244
Power Line Basic PLC Program (P3)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0