P3: Basic PLC Program for SINUMERIK 840D sl
13.13 Block descriptions
Basic Functions
1064 Function Manual, 09/2011, 6FC5397-0BP40-2BA0
The input signal is evaluated in FC 26 with the help of the edge trigger flag. The active coordinate system is
shown in the following output signal:
• AB n + 0, Bit0 (MCS/WCKS) with 0 = MCS, 1 = WCS
In case of active MCS the traversing key signals of the axes 1-6 are transferred in the axis-specific interfaces
(DB31,....DBX4.6 and DBX4.7 (traversing key +/-)) of the axes specified in the machine axis tables (DB10.DBB8
to DBB13 or DBB32 to DBB37).
In case of active WCS it is assumed that the axes 1-3 of the machine axis table are geometric axes. For this
reason the traversing key signals:
• of the axes 1-3 (EB n + 2 / 3, Bit0 - Bit2) are transferred in the interface of the geometric axes in
DB21,....DBB 12 + (n * 4), with n = 0, 1, 2), Bit 6 and Bit 7 (traversing keys +/-) of the channel specified with
the parameter "ChanNo" .
The assignment of the traversing key signals of the axes 1, 2 and 3 to the geometric axes 1, 2 and 3 of the
channel is permanent and may not be changed.
• of the axes 4-6 (EB n + 2 / 3, Bit3 - Bit5) are transferred in the axis-specific interface (DB31,....DBX4.6 and
DBX4.7 (traversing keys +/-)) of the axes 4 - 6 entered in the machine axis table (DB10.DBB11 to DBB13 or
DBB35 to DBB37).
No traversing of machine axes in WCS
In case of active WCS (AB n + 0, Bit 0 = 1) the traversing of the machine axes can be locked. For this, the
following output signals are to be set in the PLC user program:
• AB n + 3, Bit 7 = 1 (For WCS: no machine axes)
Requirement to the FC 26, not to transfer any traversing key signals for the machine axes. The traversing key
signals for the axes 1 - 3 of the machine axis table are transferred to the geometric axes 1 - 3 of the specified
channel. The traversing key signals for the axes 4 - 6 of the machine axis table are not transferred.
• AB n + 2, Bit 6 (axes 7 - n selected)
Requirement at the FC 26 not to transfer any traversing key signals, since the axes 1 - 6 of the machine axis
table are switched over. The axes 1 - 3 are thus not geometric axes, but instead also machine axes.
Feed override
The value of the HT8 override switch is transferred as feed override in the chanel-specific interface
DB21,....DBB4 (feedrate override) of the programmed channel (parameter: "ChanNo") and in the axis-specific
interfaces DB31,....DBB0 (feedrate override) of the axes programmed in the table DB10.DBB8to DBB13
(machine axis number).
Rapid traverse override
Is for the programmed channel (parameter: "ChanNo") the signal DB21,....DBX25.3=1 (feedrate override for
rapid traverse) set, the value of the HT8 override switch is set as rapid traverse override in this channel-specific.
Interface in DB21,....DBB5 (rapid traverse override) and in addition the signal DB21,....DBX6.6=1 (rapid
traverse override active) is set.
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