Siemens SINUMERIK 840D sl Function Manual page 485

Functions SBH, SG, SE, SN
A STOP F (displayed using Alarms 27001, 27101 and onwards or F01711) only results in a
subsequent STOP B/A response, if at least one of the safety-related functions SBH, SG, SE,
SN or n<n
STOP F does not result in a subsequent STOP B/A response.
This means that if "n<n
SN functions must be active or selected (e.g. by selecting a high SG level).
Note
If the axis/spindle runs at a speed n
channels, the SGA "n < n
This must be taken into account in the safe processing of the SGA.
SG active, bits 0, 1
The SGA "SG active bits 1, 0" displays which safely reduced speed and therefore which speed
limit value is actively monitored. The SGAs are only updated if the function "SBH/SG" is
enabled and SG is active (SGE "SBH/SG deselection" = 0 and "SBH deselection" = 1).
SGA
SG ac‐ SG ac‐ SBH/
tive tive SG ac‐
bit 1 bit 0 tive
= 0 = 0 1
= 0 = 0 1
= 0 = 1 1
= 1 = 0 1
= 1 = 1 1
= 0 = 0 0
Note:
The state "SG active bits 1, 0" = "0" has different meanings. A clear interpretation can be obtained by additionally evaluating
the SGAs "SBH active" and "SBH/SG active".
Communication failure
For a sign-of-life error or CRC error, this signal is set to TRUE. The PLC-SPL remains functional
in so much that the drive monitoring channel is not required. SGE to the drive are not effective.
The SGA from the drive are frozen at the state before communications failed.
Response time of the PLC when the sign of life character from the drive fails: 3 s
Response time of the PLC for CRC errors from the drive: 1 PLC cycles
Ongoing behavior depends on the bit "Acknowledgment communication failure". The fault
situation can only be executed with POWER ON.
Safety Integrated
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
WARNING
synchronization is active or selected. If only the function "n < n
x
" is used as a safety function, then at least one of the SBH, SG, SE,
x
" can have different states.
x
SBH ac‐
tive
1 SBH is active (safely reduced speed is not active)
0 Speed limit value for SG1 active
0 Speed limit value for SG2 active
0 Speed limit value for SG3 active
0 Speed limit value for SG4 active
0 Neither SBH nor SG is active
, then as a result of actual differences in the two monitoring
x
Meaning
Data descriptions
9.6 Interface signals
" is active, then a
x
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