DIGIVEX Motion - PROFIBUS
8
PVD 3554 GB 01/2004
PKW
PZD
PKE
IND
PWE
STW1
ZSW1
STW2
ZSW2
1
st
word
2
nd
word
3
rd
word
4
th
word
1
st
word
2
nd
word
PPO1
PPO3
PKW: Parameter identifier and value
PZD: Process data
PKE: Parameter identifier and request type
STW: Control word
IND:
Index
ZSW:
Status
word
PWE: Parameter value
The various essential tasks are accounted for by subdividing the useful data into PKW parameter
data, and PZD process data.
Parameter setting data area (PKW)
The PKW (parameter identifier value) telegram section is used for monitoring and/or modifying
any of the parameters in the drive. The required request / response identifier mechanisms are
described in section 2.4 ” PKW mechanism”.
Process data area (PZD)
Process data is used to transmit control words (requests: master
→
drive) or status words
(responses: drive
→
master).
2.1.2 DIGIVEX Motion response time
The DIGIVEX Motion response time with regard to PZD is 0.8 milliseconds.
This is the time between the “control word arriving in the DP slave” and the “status word being
made available to PROFIBUS-DP”.
The DIGIVEX Motion response time for a PKW, parameter modification, goes up to 1.5
milliseconds.