Siemens SINUMERIK 840D sl Function Manual page 581

2.2.2 Mode change
Introduction
A mode change is requested and activated via the mode group interface (DB11, ...). A mode
group will either be in AUTOMATIC, JOG, or MDA mode, i.e., it is not possible for several
channels of a mode group to take on different modes at the same time.
What mode transitions are possible and how these are executed can be configured in the
PLC program on a machine-specific basis.
Note
The mode is not changed internally until the signal "Channel status active" is no longer
pending. For error-free mode change however, all channels must assume a permissible
operating mode.
Possible mode changes
The following table shows possible mode changes for one channel.
Table 2-1 Mode change
from
To
AUTOMATIC
JOG
MDA
Possible mode changes are shown by an "X".
Basic logic functions: Mode group, channel, program operation, reset response (K1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
AUTOMATIC
RESET Interrupt RESET
X
X X
X X X
JOG
AUTO MDA
Interrupt Interrupt RESET
X X
X
X
Detailed description
2.2 Mode groups
MDA
JOG without AUTO
handwheel
Interrupt active Interrupt
X X
23