Siemens SINAMICS G120 CU250S-2 Series, Compact Operating Instructions

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Commissioning
4.2 Connecting the inverter to the fieldbus
CU250S-2 Control Units
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Compact Operating Instructions, 05/2014, A5E32899990B AB
4.2 Connecting the inverter to the fieldbus
Where can I find instructions for the fieldbus connection of the inverter?
You can find instructions for the fieldbus connection on the Internet:
● Application examples ( http://support.automation.siemens.com/WW/view/en/60733299 )
● Operating Instructions, "Inverter with CU250S-2 Control Units": Manuals for the Control
Unit ( http://support.automation.siemens.com/WW/view/en/30563628/133300 )
● Function Manual, "Fieldbusses": Manuals for the Control Unit
( http://support.automation.siemens.com/WW/view/en/30563628/133300 )
Example telegram
Telegram 1 Abbreviation Explanation
STW1 Control word 1
ZSW1 Status word 1
PZD01/02 Process data 16-bit
NSOLL_A Speed setpoint 16-bit
NIST_A Actual speed value 16-bit
The inverter telegrams without configured basic positioner are described in the Operating
Instructions and in the "Communications" Function Manual: Manuals for the Control Unit
( http://support.automation.siemens.com/WW/view/en/30563628/133300 )
The telegrams with configured basic positioner are described in the "Basic Positioner and
Technology" Function Manual: Manuals for the Control Unit
( http://support.automation.siemens.com/WW/view/en/30563628/133300 ).
Control word 1 (STW1)
Bit Meaning Explanation
0 0 = OFF1 The motor brakes with the ramp-down time p1121 of the ramp-function generator.
The inverter switches off the motor at standstill.
0 → 1 = ON The inverter goes into the "ready" state. If, in addition bit 3 = 1, then the inverter
switches on the motor.
1 0 = OFF2 Switch off the motor immediately, the motor then coasts down to a standstill.
1 = No OFF2 The motor can be switched on (ON command).
2 0 = Quick stop (OFF3) Quick stop: The motor brakes with the OFF3 ramp-down time p1135 down to
standstill.
1 = No quick stop (OFF3) The motor can be switched on (ON command).
3 0 = Inhibit operation Switch off the motor immediately, the motor then coasts down to a standstill.
1 = Enable operation The motor can be switched on (ON command).
4 0 = Disable RFG The inverter immediately sets its ramp-function generator output to 0.
1 = Do not disable RFG The ramp-function generator can be enabled.