Siemens SIMOVERT MASTERDRIVES Manual page 272

Communication / USS
8.1.4.4 Bus termination, USS protocol
NOTE
8.1-28
In order to ensure interference-free USS operation, the bus cable must
be terminated with bus terminating resistors at both ends. The bus
cable from the first USS node to the last USS node is to be regarded as
one bus cable. The USS bus therefore must be terminated twice. The
bus terminating resistors must be switched in at the first bus node (e.g.
master) and last bus node (e.g. converter).
Compact PLUS
SIEMEN S
S1
X101
X103
Shield connection
for control cables
Fig. 8.1-13 S1 bus-terminating switches in the Compact PLUS type of unit
In the Compact and chassis type units, two mutually independent USS
interfaces (SCom1 and SCom2) are available. Switch S1 or S2 is
provided for switching in the terminating resistor.
If the bus-terminating node is a T100 board, the bus terminating
resistors are switched in through the two plug-in jumpers, X8 and X9.
−
X100
A
B
C
Shield connection
for motor cable
6SE7087-6QX70 (Version AD)
Compendium Motion Control
02.2004
S1
OFF
ON
Switch for
bus termination
Siemens AG
SIMOVERT MASTERDRIVES