Siemens SINAMICS V20 Operating Instructions Manual page 169

Parameter Function
P0700 Selection of command source
P1000 Selection of frequency setpoint
P2023 RS485 protocol selection
P2010[0] USS/MODBUS baudrate
P2011[0] USS address
P2012[0] USS PZD (process data) length
P2013[0] USS PKW (parameter ID value) length
P2014[0] USS/MODBUS telegram off time [ms]
r2024[0] USS/MODBUS error statistics
...
r2031[0]
r2018[0...7] CO: PZD from USS/MODBUS on
RS485
P2019[0...7] CI: PZD to USS/MODBUS on RS485
P2034 MODBUS parity on RS485
P2035 MODBUS stop bits on RS485
SINAMICS V20 Inverter
Operating Instructions, 11/2016, A5E34559884-006
Setting
= 5: USS/MODBUS on RS485
Factory default: 1 (operator panel)
= 5: USS/MODBUS on RS485
Factory default: 1 (MOP setpoint)
= 1: USS (factory default)
Note: After changing P2023, powercycle the inverter. Dur-
ing the powercycle, wait until LED has gone off or the dis-
play has gone blank (may take a few seconds) before re-
applying power. If P2023 has been changed via a PLC,
make sure the change has been saved to EEPROM via
P0971.
Possible settings:
= 6: 9600 bps (factory default)
= 7: 19200 bps
= 8: 38400 bps
...
= 12: 115200 bps
Sets the unique address for the inverter.
Range: 0 to 31 (factory default: 0)
Defines the number of 16-bit words in PZD part of USS
telegram.
Range: 0 to 8 (factory default: 2)
Defines the number of 16-bit words in PKW part of USS
telegram.
Possible settings:
= 0, 3, 4: 0, 3 or 4 words
= 127: variable length (factory default)
If time set to 0, no fault is generated (i.e. watchdog disa-
bled).
The state of the telegram information on RS485 is reported
regardless of the protocol set in P2023.
Displays process data received via USS/MODBUS on
RS485.
Displays process data transmitted via USS/MODBUS on
RS485.
Sets the parity of MODBUS telegrams on RS485.
Possible settings:
= 0: no parity
= 1: odd parity
= 2: even parity
Sets the number of stop bits in MODBUS telegrams on
RS485.
Possible settings:
= 1: 1 stop bit
= 2: 2 stop bits
Communicating with the PLC
7.1 USS communication
169