K5: Mode groups, channels, axis interchange
5.3 Channels - only 840D sl
Extended Functions
Function Manual, 03/2013, 6FC5397-1BP40-3BA1
317
Example:
A system comprises a main spindle and counterspindle. Two slides can operate on both the
main spindle and counterspindle. Each slide is controlled from a separate channel. The main
spindle is in channel 1, the counterspindle in channel 2. Channel 1 is tested and channel 2 is
disabled using the channel-specific NC/PLC interface signal DB21, ... DBX1.7 (activate
program test). The two workpiece spindles - main spindle and counterspindle - play
somewhat of a "special role". A workpiece can be machined, without having to absolutely
traverse the workpiece spindle in real terms in the channel. This is the reason why it is
necessary that both workpiece spindles or both workpiece spindle aggregates actually move
in real terms (where relevant, including axes at the workpiece).
Note
The "program test" state can only be activated/deactivated in the stopped channel state.
However, the axis-specific NC/PLC interface signal "suppress program test" can always be
activated.
Diagnostics
The "program test" state can be interrogated using system variables:
● For the display in the user interface, in synchronized actions or with a preprocessing stop
in the part program via the system variables:
$AC_ISTEST "Program test" state for the channel
Supplies TRUE (1), if the "program test" state for the channel is
active.
$AA_ISTEST[<n>] "Program test" state for the axis <n>
Supplies TRUE (1), if the "program test" state for axis <n> is active.
● Without preprocessing stop in the part program via the system variable:
$P_ISTEST Supplies TRUE (1), if the "program test" state for the channel is
active.
Example:
The channel runs under "program test" and axis "C" was withdrawn using "suppress program
test". A query using system variables then supplies the following result:
$AC_ISTEST = TRUE
$P_ISTEST = TRUE
$AA_ISTEST[C] = FALSE
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