NORD Drivesystems BU0020 - Manual (Page 73)

7 Data transmission
BU 0020 GB-2612 73
7.3 Process data (PZD)
In the process data area (PZD), control words and setpoints are transferred from the master to the
frequency inverter and in return, status words and actual values are sent from the inverter 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 Controlword; length 16Bit, order telegram
contains control bits (e.g. Enable, Emergency Stop, Error Acknowledgement)
ZSW Ztatusword; length 16Bit, response telegram
contains status bits (e.g. FI running, Error)
SW 1 … 3 Setpointvalues; maximum of 3 possible, 16 or 32Bit, order telegram
e.g. frequency setpoint, position setpoint, torque setpoint
IW 1 … 3 Actual wvalues; maximum of 3 possible, 16 or 32Bit, response telegram
e.g. frequency actual value, position actual value, torque actual value
Note
The SK 54xE frequency inverter can administer 5 setpoint or actual values. However,
the Profibus bus system can only process setpoint or actual values 1 ... 3 (PPO1 ...
PPO4).
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7.3.1 Process data, SK 300E / 700E / 750E
1st word 2nd word 3rd word 4th 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
SW3
IW3
SW2
IW2
PP0 type
2,4
PZD area with 1x 32-Bit setpoint
and 1x 16-Bit STW
ZSW SW1
IW1
SW2
IW2
PP0 type
2,4
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