Siemens SINUMERIK 840D sl Function Manual page 369

05.08
SG active, bits 1, 0
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).
Table 8-8 Display of the active safely reduced speed
SGA
SG SG SBH/
active active SG
Bit 1 Bit 0 active
=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 evalu-
ating 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 effective. The SGA from the drive are frozen at the state be-
fore communications failed.
Response time when the sign of life character from the drive fails: 3 s
Response time for CRC errors from the drive: 3 PLC cycles
Fault, data transfer
For a 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 effec-
tive. The SGA from the drive are frozen at the state before communications failed.
Response time for CRC errors from the drive: 3 PLC cycles
© Siemens AG 2008 All Rights Reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 05.2008 Edition
SBH
active
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
Data Description
8.3 Interface signals
Description
8-369