BECKHOFF AX2000 PROFIBUS DP communication profile - Manual (Page 15)

3 Profile of AX2000/2500
The PROFIBUS-profile PROFIDRIVE includes the following parameter process-data objects (PPO):
AX2000/2500 only uses the PPO-type 2 (with 4 words PKW-section and 6 words PZD-section). The
PKW-section is used mainly for the transmission of parameters for the servo amplifier, the
PZD-section is used principally for handling motion functions.
The telegram can be divided into two sections or data channels:
1.
PKW-section (4 words, Bytes 1 to 8)
2. PZD-section (6 words, Bytes 8 to 20)
The PKW data channel can also be termed the service or parameter channel. The service channel
only uses confirmed communication services, and is used by AX2000/2500 as a parameter chan-
nel.
This channel has no real-time capability.
The PZD data channel can also be termed the process data channel. The process data channel
uses unconfirmed communication services. The response of the servo amplifier to an unconfirmed
service can only be seen in the reaction of the amplifier (status word, actual values).
This channel has real-time capability.
PROFIBUS for AX2000/2500 15
BECKHOFF
12/05
Profile of AX2000/2500