Siemens 6RA7086-6KS22 Operating Instructions Manual page 382

Function descriptions
USS protocol: Brief start-up guide for 6RA70 converters
Select USS protocol
Baud rate
No. of process data (PZD No.)
(applies to Receive and Send)
PZD assignment for control word
and setpoints
(received process data)
No. of PKW
PZD assignment for actual
values
(transmitted process data)
Node address
Telegram failure time
Bus termination
Bus / point-to-point
communication
2-wire / 4-wire transmission
via RS485 interface
Cable
9-26
G-SST1
RS232 / RS485
P780 = 2
P783 = 1 to 13, corresponding to
300 to 187500 baud
P781 = 0 to 16
All received process data are
taken to connectors and must be
wired up as required
P782 =
0: No PKW data
3 / 4: 3 / 4 PKW data words
127: Variable data length for
→
slave master
Selection of transmitted values
via P784
P786 = 0 to 30
P787 = 0.000 to 65.000s
P785 = 0: Bus term. OFF
1: Bus term. ON
RS232: Only point-to-point
operation possible
RS485: Bus operation possible
2-wire operation is selected
automatically
Connector assignments, see
Sect. 6.8 or Sheet G170 in
Sect. 8
G-SST1
RS485
for connection of an OP1S
P780 = 2
P783 = 6 (9600 Bd) or
7 (19200 Bd)
The baud rate setting must be
identical for every node in bus
operation
P781 = 2
If the control bits from the OP1S
are to be used:
Word 1 (connector K2001):
Wiring up of control bits
from OP1S, see Sec. 7.2.2
Word 2 (connector K2002):
Not used
P782 = 127 variable data length
Word 1: P784.i01=32
(stat. word 1 K0032)
Word 2: P784.i02=0
P786 = 0 to 30
Every node must have its own,
unique address for bus operation
P787 = 0.000s
P785 = 0: Bus term. OFF
1: Bus term. ON
Bus operation possible
2-wire operation is selected
automatically
See operating instructions for
OP1S operator panel
SIMOREG DC Master
05.05
G-SST2 / G-SST3
RS485
P790 / P800 = 2
P793 / P803 = 1 to 13,
corresponding to 300 to 187500
baud
P791 / P801 = 0 to 16
All received process data are
taken to connectors and must be
wired up as required
P792 / P802 =
0: No PKW data
3 / 4: 3 / 4 PKW data words
127: Variable data length for
→
slave master
Selection of transmitted values
via P794 / P804
P796 / P806 = 0 to 30
P797 / P807 = 0.000 to 65.000s
P795 / P805 =
0: Bus term. OFF
1: Bus term. ON
Bus operation possible
2-wire operation is selected
automatically
Connector assignments, see
Sect. 6.8 or Sheets G171, G172
in Sect. 8
SIEMENS AG 6RX1700-0AD76
Operating Instructions