NORD Drivesystems BU0050 - Manual (Page 29)

1.5 USS - Data transfer
BU 0050 GB-3111 Subject to technical amendments 29
1.5.3 Process data (PZD)
In the process data area PZD, control words and setpoints are transferred from the master to the slave
(frequency inverter) and in return, status words and actual values are sent from the slave to the master. The
structure of the PZD area is always the same in terms of the sequence of its elements (words), however,
dependent upon direction of data Master

Slave / Slave

Master, it is designated differently
The process data area of the reference data has the following structure:
- STW: Controlword; length 16 Bit, order telegram
contains control bits (e.g. enable, quick stop, error acknowledgement)
- ZSW: Statusword; length 16 Bit, response telegram
contains status bits (e.g. FI running, error)
- SW1..3: Setpointvalues; maximum of 3 possible, 16 or 32Bit, order telegram
e.g. frequency setpoint value, position setpoint value, torque setpoint value
- IW1..3: Actualvalues; maximum of 3 possible, 16 or 32Bit, response telegram
e.g. actual frequency value, actual position value, actual torque value
1.5.3.1 Process data for SK 300E/700E/750E
1st word 2nd word 3rd word 4th word
PZD area with
1x16 bit setpoint
STW
ZSW SW1
IW1
PZD area with up to 3
16 bit setpoints
STW
ZSW SW1
IW1
SW3
IW3
SW2
IW2
PZD area with 1x 32-Bit setpoint
and 1x 16-Bit STW
ZSW SW1
IW1
SW2
IW2
1.5.3.2 Process data for SK 500E (entire series)
1st word 2nd word 3rd word 4th word
PZD area with
1x16 bit setpoint STW
ZSW SW1
IW1
PZD area with up to 3
16 bit setpoints STW
ZSW SW1
IW1
SW2
IW2
SW3
IW3
Note: 32-Bit setpoints consist of High and Low words (16-Bit each).