Description Of Stop A - Siemens SINUMERIK 840D sl Function Manual

Safety functions integrated in the system/drive
7.3 Safe Stops A-F
Acknowledging a stop request
After requesting a specific stop type via SGE, this sequence can be cancelled by one of the
following events:
● Deselecting the stop request
● Selecting a stop request using an SGE with a higher priority
● A higher stop request (STOP A; B; C or D) with a higher priority is received from an internal
monitoring function
Effects of the stop responses on other axes/spindles
If a stop response is initiated, then this has the following effects on all of the other axes in the
same channel:
STOP E: Extended stop and retract initiated
STOP D: Braking along a path
STOP C: NCK: IPO fast stop (braking at the current limit/OFF3 ramp)
STOP A: IPO fast stop (braking at the current limit)
The effect on the other axes in the channel can be influenced using MD36964
$MA_SAFE_IPO_STOP_GROUP. This allows, for example, the pulses of the spindle to be
safely cancelled (with an external STOP A). This means that the spindle can be manually
rotated and the axes can still be safely monitored while it is moving.
STOP
C
D
E
7.3.2

Description of STOP A

When STOP A is activated, safe standstill (SH) is active (see Chapter "Switch-off signal
paths (Page 103)").
Action in the drive monitoring channel:
Pulses are immediately cancelled using the internal signal "cancel pulses". In addition, the
pulses in the gating unit are cancelled by a software function.
Action in the NCK monitoring channel:
118
$MA_SAFE_IPO_STOP_GROUP = 0
Axes that interpolate with the involved axis
brake at the current limit / OFF3 ramp. All
other axes brake along the parameterized
braking ramp.
Axes/spindles brake along the path or
along the parameterized braking ramp.
ESR enabled and active:
ESR is initiated
ESR neither active nor enabled:
After a delay time of max. 2 IPO clock cycles, the behavior as described for STOP D is initiated.
$MA_SAFE_IPO_STOP_GROUP = 1
Axes that interpolate with the involved axis brake
at the current limit / OFF3 ramp. All other axes
do not brake.
Axes that interpolate with the involved axis brake
along the parameterized braking ramp. All other
axes do not brake.
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Safety Integrated