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Communication / USS
02.2004
6SE7087-6QX70 (Version AD) Siemens AG
8.1-34
Compendium Motion Control
SIMOVERT MASTERDRIVES
USS protocol at the SCB2 board
♦
Settings:
USS protocol with 19.2 kbit/s and 4-word PKW area and 2-word
PZD area
•
4-word PKW area:
With this setting, all parameters whose values are 16-bit (= 1
word) or 32-bit (double word) quantities can be read or written via
the USS protocol.
•
2-word PZD area:
Transfers control word 1 and a setpoint (each of them 16 bit)
from the master to the converter and control word 1 and an
actual value (each of them 16 bit) from the converter to the
master.
♦
Preconditions:
P060 = 1 or 7
♦
Parameterization of the interface on the SCB2 board:
Parameter
number
Parameter Value
Comments
P682 SCB
protocol
2 Physical bus cable, 2-wire USS
protocol (according to /1/, only USS
operation with 2 wires is defined).
Parameter
number
Parameter Index
and
value
(index i003 for SCB2)
Comments
P700
SCom/SCB BusAddr
i003 = 21
Bus address SCom2 = 21
P701
SCom/SCB Baud rate
i003 = 7
19.2 kbit/s
P702
SCom/SCB PKW #
i003 = 4
4-word PKW
P703
SCom/SCB PcD #
i003 = 2
2-word PZD
P704
SCom/SCB TlgOFF
i003 = 0 to 6500
0: No monitoring
>0: Monitoring time in ms
Example 3