Siemens Sinumerik 840D sl Function Manual page 509

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Table 8-7 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
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 cycle
Ongoing behavior depends on the bit "Acknowledgment communication failure".
The fault situation can only be executed with POWER ON.
Fault, data transfer
This signal is used to diagnose the cause for the set signal "communication error".
1 signal:
0 signal:
Acknowledgment, communication failure
It is possible to acknowledge faults that are displayed via the "communication
failure" bit using the "acknowledgment communication failure" signal. This acknowl-
edgment must be made in the same OB1 cycle as when the "communication
failure" signal occurred as 0/1 edge.
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SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
SBH
active
1
SBH is active (safely reduced speed not active)
0
Speed limit value active for SG1
0
Speed limit value active for SG2
0
Speed limit value active for SG3
0
Speed limit value active for SG4
0
Neither SBH nor SG active
There is a CRC error
There is no CRC error
Data Description
8.6 Interface signals
Meaning
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