Siemens SINUMERIK 840D sl Function Manual page 307

DC link state (on/off)
The display contains the following drive warning:
State 0: DC link voltage = ON
State 1: DC link voltage is below warning threshold.
The warning threshold corresponds to machine datum:
MD1604 $MD_LINK_VOLTAGE_WARN_LIMIT (DC link undervoltage warning threshold).
Enable pulses
Message indicating whether the drive pulses have been enabled.
State 0:
State 1:
Display corresponds to IS DB31, ... DBX93.7 ("Enable pulses").
References:
/FB1/ Function Manual Basic Functions; Various Interface Signals (A2).
Drive ready
Display of the current status of the selected drive.
State 0: The drive is not ready.
State 1: The drive is ready.
Display corresponds to IS DB31, ... DBX93.5 ("Drive Ready").
References:
/FB1/ Function Manual Basic Functions; Various Interface Signals (A2)
Display indicating the current rampup phase of the selected drive.
Meaning:
CRC error
Display of communications errors detected in hardware between NC and drive.
Note
If the display shows a value other than "0", please contact your SIEMENS Regional Office!
Basic logic functions: Diagnostic tools (D1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
The drive module pulses are suppressed. The axis/spindle can therefore not
be traversed.
The drive module pulses are enabled. The axis/spindle can now be traversed.
2.4 Drive service display (for digital drives only)
Detailed description
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