Communicating with the PLC
7.2 MODBUS communication
SINAMICS V20 Converter
186 Operating Instructions, 10/2019, A5E34559884-012
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, P2021, P2023 retain their values after a
P0700 Selection of command source = 5: USS/MODBUS on RS485
Factory default: 1 (operator panel)
P2010[0] USS/MODBUS baudrate Possible settings:
= 6: 9600 bps (factory default)
= 7: 19200 bps
= 8: 38400 bps
...
USS/MODBUS telegram off time [ms]
If time set to 0, no fault is generated (i.e. watchdog disabled).
P2021 Modbus address Sets the unique address for the converter.
Range: 1 to 247 (factory default: 1)
Modbus reply timeout [ms]
Range: 0 to 10000 (factory default: 1000)
P2023 RS485 protocol selection = 2: Modbus
Factory default: 1 (USS)
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.
r2024[0]
...
USS/MODBUS error statistics The state of the telegram information on RS485 is reported regard-
less of the protocol set in P2023.
r2018[0...7] CO: PZD from USS/ MODBUS on
Displays process data received via USS/MODBUS on RS485.
CI: PZD to USS/MODBUS on RS485
Displays process data transmitted via USS/MODBUS on RS485.
P2034 MODBUS parity on RS485 Sets the parity of MODBUS telegrams on RS485.
Possible settings:
= 0: no parity
= 1: odd parity
P2035 MODBUS stop bits on RS485 Sets the number of stop bits in MODBUS telegrams on RS485.
Possible settings:
= 1: 1 stop bit
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