Siemens SINAMICS DCM Operating Instructions Manual page 483

The second CUD must be parameterized as an "independent node" for the parallel-
connection interface, meaning that it participates in BICO exchange between multiple CUDs.
Table 10- 28 Assigning parameters in cases where several SINAMICS DC MASTER units are not connected in parallel at
the power unit side
Left-hand CUD
p51800 = 1 Independent node
p51801 Number of words to be sent
p51802 = 2 Minimum number of stations
p51803 = 0 "n+m mode" not active
p51804[..] Establish required BICO connections
p51805 = 1 Bus terminator
p51806 = Unique station address
Table 10- 29 Assigning parameters in cases where several SINAMICS DC MASTER units are connected in parallel at the
power unit side
Left-hand CUD
p51800 Required as with parallel connection of
power units
p51801 Number of words to be sent
p51802 Required as with parallel connection of
power units
p51803 Required as with parallel connection of
power units
p51804[..] Establish required BICO connections
p51805 Required as with parallel connection of
power units
p51806 = Unique station address
Normally, on the CUD on the right-hand slot the closed-loop drive control (setpoint
processing, ramp-function generator, closed-loop speed control, armature-current control,
closed-loop EMF control, closed-loop field-current control) are not required.
For that reason it makes sense to deactivate the closed-loop drive control (with p50899[0..6]
= 0, see also function diagram 1721) in order to gain more CPU time for free function blocks
and, especially, for application-specific function diagrams created with DCC.
SINAMICS DCM DC Converter
Operating Instructions, 1.2012, C98130-A7066-A1-05-7619
10.28 Expanding the SINAMICS DCM to include a second CUD
p51800 = 1
p51801
p51802 = 2
p51803 = 0
p51804[..]
p51805 = 1
p51806 =
p51800 = 1
p51801
p51802
p51803 = 0
p51804[..]
p51805 = 0
p51806 =
Descriptions of functions
Right-hand CUD
Independent node
Number of words to be sent
Minimum number of stations
"n+m mode" not active
Establish required BICO connections
Bus terminator
Unique station address
Right-hand CUD
Independent node
Number of words to be sent
Required as with parallel connection of
power units
"n+m mode" not active
Establish required BICO connections
No bus terminator
Unique station address
481