Siemens SINUMERIK 840D sl Function Manual page 481

After this time has elapsed, the system automatically changes over to SBH.
If a stop request is active, SGA "STOP E is active" is set in the same way as it would be for
an internally triggered STOP E.
0 signal: "Stop/retraction" is requested
1 signal: "Stop/retract" is not requested
Note
Stopping with an external STOP A (pulse cancellation) and/or external STOP C (braking along
the OFF3 down ramp) and/or ext. STOP D (braking along a path) has/have a higher priority
and can interrupt an external STOP E.
STOP E only produces a different response than STOP D if the user has configured the ESR
function - extended stop and retract - and initiation of the ESR is programmed depending on
$VA_STOPSI or $A_STOPESI. If no ESR is active, the STOP E behaves like a STOP D.
However, if the ESR was incorrectly configured, there is a delay up to the time
$MC_ESR_DELAY_TIME1 and $MC_ESR_DELAY_TIME2 compared to STOP D until the
braking operation is initiated.
After these times have expired, braking is initiated at the current limit.
Close SGE brake (only the drive)
Using this SGE, a mechanical brake, that is controlled from the drive brake control, is closed.
It is used to check brake closing while testing the mechanical brake system.
● If this SGE is set, the brake is closed.
● If this SGE is deleted, then the brake assumes the status of the drive brake control - i.e. it
is not forcibly opened (no positive opening).
Note
This SGE must be connected to the brake control using a BiCo interconnection in the drive
(p0858 to source r9719, bit 13). This connection is parameterized as standard.
"Selection of the velocity setpoint limit" control signals
MD36933 $MA_SAFE_DES_VELO_LIMIT contains 4 values:
The selection of one of these values is realized via the axis-specific PLC user interface
DB3x.DBX34.0...1.
Meaning of this interface:
Bit 0 "Setpoint limiting bit 0"
Bit 1 "Setpoint limiting bit 1"
Bit 0
= 0
= 0
Safety Integrated
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Bit 1 Active setpoint limiting factor
= 0 SAFE_DES_VELO_LIMIT0
= 1 SAFE_DES_VELO_LIMIT1
Data descriptions
9.6 Interface signals
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