Connection  09.02 
3-56  Siemens AG    6SE7087-6AK85-1AA0 
  Rectifier/Regenerating Unit    Operating instructions 
3.8.4  Control/status word for 12-pulse mode (r599) and control word 2, bit 23 
The following table shows how the bits of the control/status word for 12-pulse mode (r599) are formed from the 
bits of control words 1 and 2 (r550, r551),  the bits of status word  1 (r552), the bits of the first SST2 receive 
data (r599 sent from the Peer-to-Peer partner) and the internal unit status with Boolean arithmetic or how these 
bits are connected together (negation is represented with a slash) : 
 
Control/status word for 12-pulse mode (r599) 
Bit  Logical linking (or meaning in the high state): 
r599.0 
r550.0 (ON or not OFF1) AND /r552.3 (no fault) AND r551.23 (12-pulse mode is selected) 
r599.1 
r550.1 (run condition or not OFF2) AND /r552.3 (no fault) AND r551.23 (12-pulse mode is selected)
r599.2 
r550.2 
r599.3 
r552.2 (Message for RUN state) 
r599.4 
(for internal diagnostic purposes: 1, as long as trigger delay is running, as of Software Version 4.3) 
r599.5 
Message: Unit is a Rectifier/Regenarating Unit  (high state:  Unit is a comon rectifier) 
 (P070 ≤ 100)  (P070 ≥ 101) 
r599.6 
Message: DC link forming or current identification is being carried out 
r599.7 
r550.7 (fault reset) 
r599.8 
r550.8 (typing 1 ON) AND /r552.3 (no fault) AND r551.23 (12-pulse mode is selected) 
r599.9 
r550.9 (typing 2 ON) AND /r552.3 (no fault) AND r551.23 (12-pulse mode is selected) 
r599.10 
r550.10 (PLC control) 
r599.11 
r550.11 (Ud-reduction requested) 
r599.12 
r552.10 (Message: "Regenerating ready")        or 
High when with 12-pulse mode selected (r551.23= 1), the unit is held in state r000 = "--" (because 
"circuit identification" or "forming" is taking place on the partner unit, or because the unit is waiting 
for the "run" state of the 12-pulse slave unit (while the slave unit is carrying out the earth short-
circuit test and the maximum waiting time of 5 s in state r000 = "--"  has not yet elapsed)) 
r599.13 
r552.3 (Message: NO fault) 
r599.14 
r552.14 (Message: "Motoring" (Rectifier bridge is carrying current or is ready to carry current or 
neither rectifier nor regenerating bridge are carrying current)) 
r599.15 
r550.15 (No external fault 1) 
Table 13  Control/status word for 12-pulse mode (r599) 
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