Vacon NX OPTC3, User Manual

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7
7.4 Pr ocess dat a
The pr ocess data field is used to contr ol the device (e.g. Run, Stop , Refer ence, Fault Reset) and in
r eading quick actual val ues (e.g. Output fr equency, Output cur r ent, Fault code). The size of the fiel d
var ies between 2…20 bytes. The field is str uctur ed as follows:
Pr ocess Data Master - > Sl ave (max 20 bytes)
CW REF PD1 PD2 PD3 PD4 PD5 PD6 PD7 PD8
Pr ocess Data Sl ave - > Master (max 20 bytes)
SW ACT PD1 PD2 PD3 PD4 PD5 PD6 PD7 PD8
The use of pr ocess data depends on the application. In a typical situation the device is star ted and
stopped via the Contr ol Wor d (CW) wr itten by the Master and the Rotating speed is set with Refer ence
(REF). Via PD1…PD8 the device can be given other r efer ence val ues (e.g. Tor que r efer ence).
With the hel p of the StatusWor d (SW) r ead by the Master , the status of the device can be seen. Actual
Val ue (ACT) and PD1…PD8 show the other actual val ues. See
Figur e 7- 2.
Figur e 7- 2. Contr ol of the AC drive thr ough Profibus
AC drive Profibus Board
ControlWord
P
R
O
F
IB
U
S
M
A
S
T
E
R
Reference 1
ProcessData 1
ProcessData 8
…
StatusWord
Actual Value 1
Process Dat a 1
ProcessData 8
…
A
P
P
L
IC
A
T
IO
N