Siemens SINUMERIK 840D sl Function Manual page 1235

The spindle direction (+, -) is not switched directly either, but made available as output
parameter "SpindleDir", permitting, for example, FC 18 to be parameterized. A spindle
enable signal is also switched via parameter "SpindleHold". One possible method of moving
a spindle directly is to preselect it as an axis so that it can be traversed via (axis) direction
keys.
If the machine control panel fails, the signals it outputs are preset to zero; this also applies to
"FeedHold" and "SpindleHold" output signals.
Multiple calls of FC 24 or FC 19, FC 25, FC 26 are permitted in a single PLC cycle. In this
case, the first call in the cycle drives the LED displays. Furthermore, all actions of the
parameterized block are carried out 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.
Single block processing can be selected/deselected only in the first call in the cycle.
The second machine control panel can be processed if parameter
"BAGNo" 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.
The INC selections are transferred to the mode group interface. This results in runtime
improvements. This specification is activated via the DB10 ... DBX 57.0 (INC-inputs active in
the BAG-range) through this block once after power up.
Machine control panels 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 A support for
2 MSTT is still provided within certain restrictions in the control panel blocks (support is not
provided for standard axis numbers 10 to 31, mutual interlocking of axis selections with 2
MSTT).
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 MSTT 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.
For this flexibility there are tables for axis numbers in DB 10.
For 1. Machine control panel (MCP) the table starts from the byte 8
(symbolic name: MCP1AxisTbl[1..22]) and
for 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.
Basic logic functions: PLC Basic program powerline (P3 pl)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
Detailed description
2.12 Block descriptions
251