Siemens SINUMERIK 840D Description Of Functions page 199

11.03
3.13 Behavior of Safety Integrated when the drive bus fails (from SW 6.4.15)
In the following cases, when the drive bus fails, the pulses are immediately
cancelled via terminal 663 – even if a delay time is parameterized using
$MN_SAFE_PULSE_DIS_TIME_BUSFAIL:
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3.13.2 Behavior without NCK-SPL
Without NCK-SPL, the axial NCK-SGA are directly transferred to the output
modules. The SGA that are output indicate the monitoring status at the instant
in time that the drive bus failed. After this delay time has expired, all NCK-SGA
are set to 0. However, this only applies to SGA that are output via the local
outputs on the NCU. The DMP modules on the drive bus immediately set their
outputs to 0 when the bus fails.
The axial SGE are still read-in if they are not supplied from the DMP modules
on the drive bus. This means, for example, that an immediate pulse
cancellation can be triggered (e.g. by selecting SBH). The images of the SGE
from the DMP modules on the drive bus are left at their old values.
3.13.3 Behavior with NCK-SPL
The NCK-SPL remains active as the actual value is not required for the SPL.
This means, for example, that an Emergency Off still results in an external
STOP A and therefore pulse cancellation, even if the delay time after the drive
bus failed has still not expired.
In order to correctly process NCK-SPL, the input and output quantities of the
SPL must be considered in more detail ($A_INSE, $A_OUTSE, $A_OUTSI).
The system variables $A_INSE contain the input "circuit" of the NCK-SPL. If
$A_INSE
these input quantities are received from local inputs on the NCU - or
PROFIsafe - then no other measures have to be made.
If these input quantities come from the DMP modules on the drive bus, then the
last valid image of the input circuit is used. Otherwise, with the fail-safe value of
0, an external STOP A would be immediately initiated which, in turn, results in
immediate pulse cancellation.
Example:
For an Emergency Stop, a STOP A is immediately initiated. This means that
the time up until the pulses are cancelled is extremely short. If the input
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SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
An external STOP A is selected.
A test stop or an external pulse cancellation test is selected.
The SBH function is or will be selected.
An SG stage is selected or will be selected, for which it was previously
defined, that in this SG stage, no ESR will be executed when the drive bus
fails (e.g. SG stage for personnel protection). This definition is made in
MD 36963 $MA_SAFE_VELO_STOP_REACTION (for the individual
SG stages) or MD 36961 $MA_SAFE_VELO_STOP_MODE (for all
SG stages together).
3 Safety-Related Functions
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