7 DeviceNet data transmission
BU 0280 GB Subject to technical amendments 67
7.2 NORDAC profile
7.2.1 Control word (STW)
The control word (STW) is the first word transferred to the frequency inverter in the process data section in
an order telegram.
PZD1 PZD2 PZD3 PZD4
STW SW1 SW2/3 SW2/3
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Meaning of the individual bits:
Bit Value Significance Comments
0 0 OFF 1 Return with the brake ramp, at f=0Hz voltage activation
1 ON Standby
1 0 OFF 2
Disable voltage; the inverter output voltage is switched off; the FI goes into
switch-on disabled status.
1 Operating condition OFF 2 is cancelled
2 0 OFF 3
Emergency stop with programmed emergency stop time; at f = 0Hz voltage
enable; the FI goes into switch-on disabled status
1 Operating condition OFF 3 is cancelled
3 0 Disable operation
Disable voltage; the inverter output voltage is switched off; the FI goes into
standby status.
1 Enable operation Output voltage enabled, run-up to present setpoint.
4 0 Disable run-up encoder
Run-up encoder is set to zero; at f = 0Hz no voltage enable; FI remains in
operation enabled status.
1 Operating condition Run-up encoder is enabled
5 0 Stop run-up encoder Freezing of actual setpoint from run-up encoder (hold frequency).
1 Enable run-up encoder Enable setpoint on run-up encoder
6 0 Disable setpoint Selected setpoint is set to zero in the run-up encoder.
1 Enable setpoint Selected setpoint on run-up encoder is activated.
7 0 No acknowledgement
With the switch from 0 to 1, errors which are no longer active are
acknowledged.
1 Acknowledge
Note: If a digital input is programmed to the function "Error ack.", this bit must
not be set permanently to 1 via the bus (otherwise this will prevent flank
detection).
8 0
1 Bit 8 active
Bus bit 8 from the control word is set. (only for SK 200E and SK 500E)
For further details of function, please refer to parameter (P481).
9 0
1 Bit 9 active
Bus bit 9 from the control word is set. (only for SK 200E and SK 500E)
For further details of function, please refer to parameter (P481).
10 0 PZD invalid The transmitted process data is invalid.
1 PZD valid Valid process data is transferred from the master.
Note: If only setpoints are transferred via the bus, this bit must be set so that
the transferred setpoint is valid.
11 0
1 Rotation right Rotation right (priority) is on.
12 0
1 Rotation left Rotation left is on.
13 0/1 Reserved
14 0/1
Parameter set switch
Bit 0
00 = Parameter set 1
01 = Parameter set 2
10 = Parameter set 3
11 = Parameter set 4
15 0/1
Parameter set switch
Bit 1
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