NORD Drivesystems BU0220 - Manual (Page 60)

PROFIBUS DP – Supplementary manualfor NORD Frequency Inverter SK 2xxE
60 Subject to technical amendments BU 0220 GB-0912
7.2.1 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

inverter / inverter

Master, it is described differently.
The process data area of the reference data has the following structure:
- STW: Control Word; length 16 bit, order telegram
contains control bits (e.g. enable, rapid stop, error acknowledgement)
- ZSW: Status Word; length 16 bit, response telegram
contains status bits (e.g. FI running, fault)
- SW1..3: Setpoints; maximum 3 possible, 16 or 32Bit, order telegram
e.g. frequency setpoint value, position setpoint value, torque setpoint value
- IW1..3: Actual values; maximum 3 possible, 16 or 32Bit, response telegram
e.g. actual frequency value, actual position value, actual torque value
1.(/5.) word 2.(/6.) word 3.(/7.) word 4.(/8.) word
PZD area with
1x16-Bit setpoint STW
ZSW SW1
IW1
PP0 Type
(1,)3
PZD area with up to 3
16-Bit setpoints STW
ZSW SW1
IW1
SW2
IW2
SW3
IW3
PP0 Type
(2,)4
Note: 32-Bit setpoints consist of High and Low words (16-Bit each).