Monitoring Functions And Interlocks Of The Individual Modes; Mode Change - Siemens SINUMERIK 840D sl Function Manual

K1: Mode group, channel, program operation, reset response
9.3 Mode types and mode type change
Following the JOG movement, the NCK deactivates "Internal JOG" again and selects AUTO
mode again. The internal mode change is delayed until the movement is complete. This avoids
unnecessary multiple switching operations, e.g. when using the handwheel. The PLC can only
rely on the "Internal JOG active" PLC signal.
The NCK will then switch to "Internal JOG" if the axis is not enabled.
See also
R1: Referencing (Page 1149)
9.3.1

Monitoring functions and interlocks of the individual modes

Channel status determines monitoring functions
Monitoring functions in operating modes
Different monitoring functions are active in individual operating modes. These monitoring
functions are not related to any particular technology or machine.
In a particular mode only some of the monitoring functions are active depending on the
operating status. The channel status determines which monitoring functions are active in which
mode and and in which operating state.
Interlocking functions in operating modes
Different interlocks can be active in the different operating modes. These interlocking functions
are not related to any particular technology or machine.
Almost all the interlocks can be activated in every mode, depending on the operating status.
9.3.2

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.
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Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions