NORD Drivesystems BU0050 - Manual (Page 47)

1.6 USS – Telegram examples
BU 0050 GB-3111 Subject to technical amendments 47
1.6.4 Writing a parameter
When transferring parameter orders, it must be taken into account that the slave does not immediately respond
to orders in the parameter channel of the master telegram, but a positive response can be delayed by one or
more communication cycles. The master must therefore repeat the required order until the corresponding slave
response is received.
The acceleration time parameter (USS No. = 102
dec
/ 66
hex
) of a frequency inverter with the USS address 3, is
to be set to the value 10sec in parameter set 2. No process data is transferred.
As the acceleration time has an internal inverter resolution of 0.01sec, a parameter value of
10 / 0.01 = 1000 (3E8
hex
) must be transferred. PPO1 was selected as the PPO type.
Procedure:

Set address (Address 03)

Select parameter (P 102
dec
/ P 66
hex
)

Select order label (2 = change parameter value (word))

Select parameter set 2 (IND = 01)

Set parameter word (1000
dec
/ 3E8
HEX
)

Send telegram

Check response telegram
The telegram is composed as follows in hexadecimal notation:
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
STX LGE ADR PKE PKE IND IND PWE PWE PWE PWE STW STW SW1 SW1 BCC
02 0E 03 20 66 00 01 00 00 03 E8 00 00 00 00 80
When the order has been fully implemented by the inverter, it responds with
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
STX LGE ADR PKE PKE IND IND PWE PWE PWE PWE ZSW ZSW IW1 IW1 BCC
02 0E 03 10 66 00 01 00 00 03 E8 09 31 00 00 88