Siemens SINUMERIK 840D sl Function Manual page 468
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K1: Mode group, channel, program operation, reset response
9.4 Channel
● A channel has an interface with the PLC. Via this NC/PLC interface, the PLC user program
can read various channel-specific status data and write requests to the channel.
● Channel-specific tool offsets (Page 1363) are active in a channel.
● Channel-specific coordinate systems (Page 681) are active in a channel.
● Each channel has a unique channel name by default. The defined channel name can be
changed in machine data:
MD20000 $MC_CHAN_NAME = "<channel name>"
Multiple channels can be combined to form a mode group. The channels of a mode group are
always in the same mode (AUTOMATIC, JOG, MDI).
Channel configuration
Channels can be filled with their own channel name via the following machine data:
MD20000 $MC_CHAN_NAME (channel name)
The various axes are then assigned to the available channels via machine data. There can be
only one setpoint-issuing channel at a time for an axis/spindle. The axis/spindle actual value
can be read by several channels at the same time. The axis/spindle must be registered with
the relevant channel.
The following channel-specific settings can also be made using machine data:
● Position of deletions or the basic program settings of G groups via the machine data:
MD20150 $MC_GCODE_RESET_VALUES (initial setting of the G groups)
● Auxiliary function groups regarding the combination and the output time.
● Transformation conditions between machine axes and geometry axes.
● Other settings for the execution of a part program.
Change in the channel assignment
An online change in the channel configuration cannot be programmed in a part program or
PLC user program. Changes in the configuration must be made via the machine data. The
changes become effective only after a new 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.
468
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions
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