02.2004 Communication / USS
Siemens AG 6SE7087-6QX70 (Version AD)
SIMOVERT MASTERDRIVES Compendium Motion Control 8.1-29
♦ When the unit is supplied, the terminating resistors are not switched
in!
♦ Please note that the bus termination is switched in only at the first
bus node (e.g. SIMATIC S 5/CP524) and last bus node (e.g.
CUPM)! When the matching resistors are being set, the electronics
box must be isolated from supply!
♦ Data transmission faults possible on the bus!
During active bus operation, the units with a switched-in
terminating resistor must not be disconnected from supply. The
matching resistor when disconnected from supply (off-load) is no
longer effective because the terminating resistor obtains its voltage
from the connected unit.
The following illustration shows an example of the bus connection at
terminal strip X100 (Compact PLUS). If the connector at terminal strip
X100 of one node is removed, data transfer via bus is not interrupted.
The other nodes on the bus continue to be supplied with data via the
bus.
RS485N
RS485P
Higher-level
computer (master)
with
activated
bus termination
Slave 1
X100
36 35 34 33
Slave 2
X100
36 35 34 33
Slave n
X100
36 35 34 33
Last slave,
bus termination
activated
S1
ON OFF
S1
ON OFF
S1
ON OFF
Connect
Shield
Connect shield to
converter housing
Fig. 8.1-14 Connection of the 2-wire bus cable at terminal strip X100
(Compact PLUS)
NOTE
Bus connection via
terminal strip
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