Siemens SINUMERIK 840D sl Function Manual page 1047

Feedrate and spindle Start/Stop are not transferred to the interface, but output modally as a
"FeedHold" or "SpindleHold" signal. The user can link these signals to other signals leading
to a feed or spindle stop (this can be implemented, e.g. using the appropriate input signals in
FC10: AL_MSG). The associated LEDs are activated at the same time.
The spindle direction (+, -) is not switched directly either, but made available as output
parameter "SpindleDir" permitting, for example, FC18 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.
FC24 or also FC19, FC25, FC26 can be called a multiple number of times 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 "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 ⇒ mode group signals are not processed.
"ChanNo" = 0 ⇒ no processing of the channel signals.
The INC selections are transferred to the mode group interface. The activation for this
specification is done via the DB10.DBX57.0 (INC inputs in BAG area active) through this block
once after power up.
Furthermore, two machine control panels can be handled in parallel by this block. The block
call for the 2nd machine control panel in OB1 cycle must be set after the call of the 1st MCP.
Support for two MCPs is provided in the control panel blocks up to certain limits (support is
not provided as standard for mutual interlocking of axis selections with identical assignments
on two MCPs).
Key-operated switch position
As of software version 4.5 SP2, the key-operated switch signals in the FC24 are also
transferred to the user interface (DBX56.5 to 7). This transfer is made independent of whether
a keyswitch is mounted on the MCP.
Note
For further information see "FC19: MCP_IFM - transfer of MCP signals to interface
(Page 1030) ".
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
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
P3: Basic PLC program for SINUMERIK 840D sl
13.17 Block descriptions
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