SINAMICS V20 Inverter
Operating Instructions, 07/2012, A5E03728167
105
Communicating with the PLC
6
The SINAMICS V20 supports communication with Siemens PLCs over USS on RS485. You
can parameterize whether the RS485 interface shall apply USS or MODBUS RTU protocol.
USS is the default bus setting. A screened twisted pair cable is recommended for the RS485
communication.
Make sure that you terminate the bus correctly by fitting a 120 R bus termination resistor
between the bus terminals (P+, N-) of the device at one end of the bus and a termination
network between the bus terminals of the device at the other end of the bus. The termination
network should be a 1.5 k resistor from 10 V to P+, 120 R from P+ to N- and 470 R from N-
to 0 V. A suitable termination network is available from your Siemens dealer.
0 V
0 V
10 V
0 V
P + N -
0 V P + N -
P + N -
0DVWHU
6ODYH
6ODYH
6ODYH
5
6
WH
UP
LQ
DW
LR
Q
QHW
ZR
UN
5
6
WH
UP
LQ
DW
LR
Q
UH
VLVWRU
6FUHHQLQJ
6FUHHQLQJ
6FUHHQLQJ
3/&
9
9
9
N˖ ˖ ˖
6.1
USS communication
Overview
One PLC (master) can connect a maximum of 31 inverters (slaves) through the serial link
and control them with the USS serial bus protocol. A slave can never transmit without first
being initiated by the master so that direct information transfer between individual slaves is
not possible.
3/&
&RQWUROZRUG
0DLQVHWSRLQW
6WDWXVZRUG
0DLQDFWXDOYDOXH
Data exchanging:
9
Содержание SINAMICS V20 Series
Страница 4: ...Preface SINAMICS V20 Inverter 4 Operating Instructions 07 2012 A5E03728167 ...
Страница 12: ...Safety instructions SINAMICS V20 Inverter 12 Operating Instructions 07 2012 A5E03728167 ...
Страница 232: ...Parameter list 7 2 Parameter list SINAMICS V20 Inverter 232 Operating Instructions 07 2012 A5E03728167 ...
Страница 274: ...Index SINAMICS V20 Inverter 274 Operating Instructions 07 2012 A5E03728167 ...