Siemens SINAMICS G120 CU250S-2 Series - Connecting the inverter to the fieldbus

Commissioning
4.2 Connecting the inverter to the fieldbus
CU250S-2 Control Units
20 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.