Switching Over The Channel - Siemens SINUMERIK 840Di sl Operating Manual

2
01/2008

2.5.7 Switching over the channel

Channel states
© S iemens AG 2008 All rights reserved.
SINUMERIK 840Di sl/840D sl/840D Operating Manual HMI-Advanced (BAD) - 01/2008 Edition
Function
It is possible to switch between channels when several are in use.
Since individual channels may be assigned to different mode
groups, a channel switchover command is also an implicit mode
switchover command.
If the selected channel is linked to another NCU (M:N link), the HMI
Advanced is also switched over implicitly to the relevant NCU.
When a "Channel menu" is configured, all existing communication
links to other NCUs plus the associated channels are displayed on
softkeys.
The following three channel statuses can occur in each mode:
1. Channel reset
The machine is in the initial state, e.g., after power-on or after end
of program. The initial state is defined by the machine-tool
manufacturer in the PLC program.
2. Channel active.
A program has been started, the program is being executed or a
reference point approach is in progress.
3. Channel interrupted
The running program or reference point approach has been
interrupted.
In this context, a program can be a main program, subprogram, cycle
or a series of NC blocks.
There are 3 different switchover levels:
1. Switch to next channel.
2. Switch over configured channel group/channels (1 NCU).
3. Switch to another NCU (with M:N link involving several NCUs).
Operator Components/Operating Sequences
2.5 General operating sequences
2
2-61