Channel - Siemens SINUMERIK 840D sl Function Manual

Possible mode changes
The following table shows possible mode changes for one channel.
AUTOMATIC
JOG
MDA
Possible mode changes are shown by an "X".
Special cases
● Errors during mode change
If a mode change request is rejected by the system, the error message "Operating mode
cannot be changed until after NC Stop" is output. This error message can be cleared without
changing the channel status.
● Mode change disable
A mode change can be prevented by means of interface signal:
DB11, DBX0.4 (Mode change disable).
This suppresses the mode change request.
The user must configure a message to the operator indicating that mode change is disabled.
No signal is set by the system.
● Mode change from MDA to JOG
If all channels of the mode group are in Reset state after a mode change from MDA to JOG,
the NC switches from JOG to AUTO. In this state, part program commands START or
INIT can be executed.
If a channel of the mode group is no longer in Reset state after a mode change, the part
program command START is rejected and Alarm 16952 is issued.
9.4

Channel

In a channel of the NC, the part programs defined by the user are executed.
The following properties characterize a channel:
● A channel is always assigned to a mode group (Page 457) (BAG).
● A channel can only execute one part program at any point in time.
● Machine, geometry, and special axes and spindles are assigned to a channel. Only these
can be traversed via the part program executed in the channel.
● A channel consists of the internal units
– Preprocessing (program decoding and block preparation)
– Main run (path and axis interpolation).
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
K1: Mode group, channel, program operation, reset response
AUTOMATIC
Reset Interrupt Reset
X
X X
X X X
JOG
AUTO MDA
Interrupt Interrupt Reset
X X
X
X
9.4 Channel
MDA
JOG without hand‐ AUTO
wheel
Interrupt active Interrupt
X X
467