Siemens CU240E-2 - Page 29

Commissioning
4.3 Connecting the inverter to the fieldbus
CU240B-2 and CU240E-2 Control Units
Compact Operating Instructions, 01/2017, A5E39910322B AA
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Control word 1 (STW1), PZD receive word 1 (word: r2050[0], bits: r2090.00 … r2090.15)
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
Precondition in order to be able to switch on the motor using bit 0 (ON command).
2
0 = Quick stop (OFF3)
The motor brakes with the OFF3 ramp-down time p1135 down to standstill.
1 = No quick stop (OFF3)
Precondition in order to be able to switch on the motor using bit 0 (ON command).
3
0 = Inhibit operation
Switch off the motor immediately → motor coasts down to a standstill.
1 = Enable operation
Precondition in order to be able to switch on the motor using bit 0 (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.
5
0 = Stop RFG
The output of the ramp-function generator stops at the actual value.
1 = Enable RFG
The output of the ramp-function generator follows the setpoint.
6 0 = Inhibit setpoint The inverter brakes the motor with the ramp-down time p1121 of the ramp-function
generator.
1 = Enable setpoint
Motor accelerates with the ramp-up time p1120 to the setpoint.
7 0 → 1 = Acknowledge faults Acknowledge fault. If the ON command is still active (bit 0 = 1), the inverter
switches to "closing lockout" state.
8, 9
Reserved
10
0 = No control via PLC
The inverter ignores the process data from the fieldbus.
1 = Control via PLC
Control via fieldbus, the inverter accepts the process data from the fieldbus.
11 1 = Direction reversal Invert setpoint in the inverter.
12
Not used
13 1 = MOP up Increase the setpoint saved in the motorized potentiometer.
14
1 = MOP down
Reduce the setpoint saved in the motorized potentiometer.
15 Reserved Changes over between settings for different operation interfaces (command data
sets).