HEIDENHAIN TNC 640 (34059x-02) ISO programming - Manual (Page 458)

Manual operation and setup
15.4 Functional safety FS (option)
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TNC 640 | User's Manual for DIN/ISO Programming | 5/2013
Additional status displays
On a control with functional safety FS, the general status display
contains additional information about the current status of safety
functions. The TNC shows this information as operating statuses of
the status displays
T, S and F
Status display Brief description
STO Energy supply to the spindle or a feed
drive is interrupted.
SLS Safely-limited speed: A safely limited
speed is active.
SOS Safe operating stop: Safe operating stop is
active.
STO Safe torque off: Energy supply to the
motor is interrupted.
The TNC shows the active safety-related mode of operation with
an icon in the header to the right of the operating mode text. If the
SOM_1 mode is active, the TNC does not display any icon.
Button Safety-related operating mode
SOM_2 mode active
SOM_3 mode active
SOM_4 mode active