NORD Drivesystems BU0070 - Manual (Page 32)

NORDAC InterBus Operating Manual
32 Subject to technical alterations BU 0070 GB
7 Example telegrams
Various example telegrams are shown below to clarify the control and parameterisation of the frequency inverter
with InterBus.
7.1 Switch-on block
→ Standby
A frequency inverter must be switched from the "Switch-on block" status (STW Bit 0 – 0), which is active when the
device is switched on, to the "Standby" status (STW Bit 0 = 1). Parameter set 1 is valid. Only the PZD channel is
evaluated.
Procedure:
• Check last status word (ZSW 0A 70)
• Generate control word (STW 04 7E)
• Check response telegram (ZSW 0A 31)
Details:
Status word of frequency inverter
→ frequency inverter is in switch-on block status
9 10 11 12
ZSW ZSW IW1 IW1
0B 70 00 00
Bit Value Value
HEX
Significance
15 0 0 Parameter set Bit 1 off
14 0 Parameter set Bit 0 off
13 0 Reserved
12 0 Rotation left is off
11 1 B Rotation right is on
10 0 Reference value undershot
9 1 Bus controller
8 1 Setpoint = actual value
7 0 7 No warning
6 1 Switch-on block
5 1 No emergency stop
4 1 Block voltage
3 0 0 No errors
2 0 Operation blocked
1 0 Not ready for operation
0 0 Not at standby
To switch the frequency inverter to the Standby status, the following telegram must be sent:
9 10 11 12
STW STW SW1 SW1
04 7E 00 00
When the frequency inverter switches to the Standby status, it sends the following response telegram:
9 10 11 12
ZSW ZSW IW1 IW1
0B 31 00 00
Note:
The control telegram must be sent cyclically as the frequency inverter may not switch to the required
status within the response time of a telegram.
Abbreviations used:
PKW
Parameter identifier Value
PZD Process data
PKE Parameter identifier
IND Index
PWE Parameter Value
STW Control word 1
ZSW Status word 1
SW1..3 Setpoint
IW1..3 Actual value