K5: Mode groups, channels, axis interchange
5.3 Channels - only 840D sl
Extended Functions
316 Function Manual, 03/2013, 6FC5397-1BP40-3BA1
Sequence
Multi-channel systems are either started at the same time or staggered in time, channel for
channel. As an alternative, the PLC can start a channel and its part program initializes and
starts the channels. The function "channel-by-channel running-in" supports both of these
versions. As a consequence, a channel group is obtained, which should operate together.
Normally, this group comprises all of the channels of the NCK being used.
Generally, a channel moves a tool adapter in the machining space and therefore the tool.
Several channels each move a tool in the same machining space and therefore require
(mandatory) synchronization between the channels in order to avoid collisions and to
organize how they operate with one another. The following synchronizations are
conceivable:
● Channel coordination via the part program commands
WAITM, WAITMC, WAITE, START.
● Channel synchronization via the PLC.
Example:
In channel 1, M107 is kept with the read-in disable until channel 2 has reached M207 and
vice versa.
● Axis interchange, i.e. a channel waits until the other channel relinquishes the axis.
● Freely programmed synchronization using global variables in the part program.
● Cross-channel couplings
● Axis container rotation
● Testing the program including the parallel synchronized actions in the main run and
synchronization of the synchronized actions with the channel.
Under these general conditions, it is almost impossible to just start one channel - it would
remain stationary at the first synchronization location.
Using the function "channel-by-channel running-in" all channels of the group are to be
started, and only a few channels, generally just one channel, actually physically moves its
axes. The other channels are then in the "program test" state.
This is the reason why users must define the channels in which they do not want any motion.
This is made from the user interface in the "Program controls" menu. When selected, the
following channel-specific signal is set in the HMI/PLC interface:
DB21, ... DBX25.7 (program test selected)
The activation is then made using the channel-specific NC/PLC interface signal:
DB21, ... DBX1.7 (activate program test)
The following interface signal is set in the PLC as checkback signal:
DB21, ... DBX33.7 (program test active)
Further, for a successful operation, it may be necessary that several axes/spindles -
especially spindles - are actually physically operated, although their channel is in the
"program test" state. The following NC/PLC interface signal is used for this purpose:
DB31, ... DBX14.0 (suppress program test)
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