Channel - Siemens SINUMERIK 828D Function Manual

K1: Mode group, channel, program operation, reset response

9.4 Channel

9.4 Channel
Assignment part program - channel
Part programs are assigned to channels.
Part programs of different channels are largely independent of each other.
Channel properties
A channel constitutes an "NC" in which one part program can be executed at a time. Machine axes, geometry
axes and positioning axes are assigned to the channels according to the machine configuration and the current
program status (AXIS CHANGE, GEO AXIS CHANGE, SETMS).
The system assigns each channel its own path interpolator with associated programming. Each channel can run
its own machining program, which is controlled from the PLC.
The following channel­specific functions make it possible for the channels to process part programs
independently:
• Each channel has its own NC Start, NC Stop, RESET.
• One feedrate override and one rapid traverse override per channel.
• Dedicated interpreter for each channel.
• Dedicated path interpolator for each channel, which calculates the path points such that all the machining
axes of the channel are controlled simultaneously from path axes.
• Selection and deselection of tool cutting edges and their length and radius compensations for a tool in a
specific channel.
For more information on tool offset, refer to:
References:
/FB1/ Function Manual, Basic Functions; Tool Offset (W1)
• Channel­specific frames and frames active in the channel for transforming closed calculation rules into
Cartesian coordinate systems. Offsets, rotations, scalings, and mirrorings for geometry axes and special axes
are programmed in a frame.
For more information on frames, refer to:
References:
/FB1/ Function Manual, Basic Functions; Axes, Coordinate Systems, Frames (K2), Chap: "External work
offset"
• Display of channel­specific alarm responses.
• Display of current machining sequence (axis position, current G functions, current auxiliary functions, current
program block) for each channel.
• Separate program control functions for each channel.
These functions (with the exception of the display functions) are controlled and checked by the PLC with
interface signals.
Channels in the same mode group always have to be operated in the same mode (AUTOMATIC, JOG, MDA).
492
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Basic Functions