User Manual 08/2003 Edition

02.99 02.00
Bus termination
for PROFIBUS
Siemens AG 2003 All rights reserved
SIMODRIVE POSMO A User Manual (POS1) – 08.03 Edition
2 Installing and Connecting–up
2.3 Connection and wiring overview
The following must be carefully observed when terminating a PROFI-
BUS–DP bus in conjunction with the ”DP slave POSMO A”:
The terminating resistor must be switched in at the first and last bus
nodes.
Is the ”DP slave POSMO A” the first or last bus node?
– If yes?
––> The bus termination must be switched–in using switch S1
(refer to Table 2-3).
––> The bus termination that is switched–in is only
effective if the electronics power supply of the positioning
motor is switched–on and the connection cover is inserted.
– If no?
––> The bus termination must be switched–out using switch S1
(refer to Table 2-3).
If it must be possible, with bus communications still operational, to
power down the SIMODRIVE POSMO A positioning motor without
resulting in errors, then the following applies:
– This ”DP slave POSMO A” may neither be used as the first nor
last bus node.
– For this ”DP slave POSMO A”, the bus termination must be
switched–out using switch S1 (refer to Table 2-3).
– Recommendation: Use an active bus terminating resistor
The ”active RS485 terminating element” bus component has its
own 24 V supply voltage and can terminate the bus independently
of the DP slave.
Order No. (MLFB): 6ES7972-0DA00-0AA0
2-43
2