NORD Drivesystems BU0070 - Manual (Page 23)

6 Data transmission
BU 0070 GB Subject to technical alterations 23
6 Data transmission
6.1 Process data (PZD)
The inverter with InterBus technology unit is a slave on the InterBus. The process date are setpoint and actual data
that need to be transmitted rapidly, e.g. motor speed.
In the process data area (PZD), control words and setpoints are transferred from the master to the slave and in
return, status words and actual values are sent from the slave to the master.
6.1.1 The control word (STW)
The control word (STW) is the first word transferred to the frequency inverter in the process data area in an order
telegram.
PZD1 PZD2 PZD3 PZD3
STW SW1 SW3 SW2
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Significance of the individual bits
Bit Value Significance Comments
0 0 OFF 1 Return with the brake ramp, at f=0Hz voltage activation
1 ON Ready for operation
1 0 OFF 2 Block voltage; the inverter output voltage is switched off, the FI goes
into switch-on block 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 block status
1 Operating condition OFF 3 is cancelled
3 0 Block operation Block 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 Block 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 Block 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
1 Acknowledge With the switch from 0 to 1, inactive errors are acknowledged.
Note: If a digital input is programmed to function "Error ack.", this Bit
must not be set permanently to 1 via the bus (this will otherwise
prevent edge detection).
8 0/1 Reserved
9 0/1 Reserved
10 0 PZD invalid The transmitted process data is invalid.
1 PZD valid Valid process data is transferred from the master.
Note: If setpoints only are transferred via the bus (setting: interface),
this Bit must be set so that the setpoint transferred is valid.
11 0
1 Rotation right Rotation right 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 Par. set switch Bit 1