Communicating with the PLC
7.1 USS communication
SINAMICS V20 Converter
178 Operating Instructions, 10/2019, A5E34559884-012
Parameter is currently deactivated; parameter has no function in the present converter status
102 Communication channel width is insufficient for response; dependent on the number of PKW and the maximum
net data length of the converter
Request is not included/task is not supported
PKW request access timeout/number of retries is exceeded/wait for response from CPU side
Parameter value cannot be changed (parameter is locked)
Changed lower/upper limits exceeded
The available access authorization does not cover parameter changes
Basic converter settings
= 30: restores to factory settings
P0970 Factory reset Possible settings:
= 1: resets all parameters (not user defaults) to their default
values
= 21: resets all parameters and all user defaults to factory
reset state
Parameters P2010, P2011, P2023 retain their values after
P0700 Selection of command source = 5: USS/MODBUS on RS485
Factory default: 1 (operator panel)
P1000 Selection of frequency setpoint = 5: USS/MODBUS on RS485
Factory default: 1 (MOP setpoint)
P2023 RS485 protocol selection = 1: USS (factory default)
After changing P2023, powercycle the converter. During the
powercycle, wait until LED has gone off or the display 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.
P2010[0] USS/MODBUS baudrate Possible settings:
= 6: 9600 bps (factory default)
= 7: 19200 bps
= 8: 38400 bps
...
P2011[0] USS address Sets the unique address for the converter.
Range: 0 to 31 (factory default: 0)
P2012[0] USS PZD (process data) length Defines the number of 16-bit words in PZD part of USS telegram.
Range: 0 to 8 (factory default: 2)
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