Siemens SINUMERIK 840D sl Function Manual page 584

Detailed description
2.3 Channel
Change in the channel assignment
An online change in the channel configuration cannot be programmed in a part program or
PLC user program. Machine data must be used to make changes to the configuration; these
changes do not take effect until the next Power On.
Container axes and link axes
An axis container combines a group of axes in a container. These axes are referred to as
container axes. This involves assigning a pointer to a container slot (ring buffer location
within the relevant container) to a channel axis. One of the axes in the container is located
temporarily in this slot.
Each machine axis in the axis container must be assigned at all times to exactly one channel
axis.
Link axes can be assigned permanently to one channel or dynamically (by means of an axis
container switch) to several channels of the local NCU or the other NCU. A link axis is a non-
local axis from the perspective of one of the channels belonging to the NCU to which the axis
is not physically connected.
The assignment between the link axes and a channel is implemented as follows:
• For permanent assignment using machine data:
• For dynamic assignment:
For more information on link axes and container axes, refer to
References:
/FB2/ Function Manual, Extended Functions; Several Operator Panel Fronts and NCUs,
Distributed Systems (B3)
Interface signals
NCK channel 1 signals lie in DB21 of the user interface, those of channel 2 in DB22. The
channel or channels can be monitored and controlled from the PLC or NCK.
Technology in channel
Machine data:
MD27800 $MC_TECHNOLOGY_MODE
can be used to relate the technology specification for the machine to specific channels.
Among other functions, this information is used for evaluation in HMI, PLC, and standard
cycles.
Siemens supplies standard machine data for milling. If the machine tool is not a milling
machine, but some other type, a different data/program block can be loaded by the HMI or
PLC depending on the technology mode set in the machine data.
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Allow the direct logic machine axis image to show link axes.
Allow the axis container slot machine data to show link axes.
Basic logic functions: Mode group, channel, program operation, reset response (K1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0