A.2.8 Profibus-Dp Communication - INVT Goodrive35 Series Operation Manual

Goodrive35 Series Closed-loop Vector Control VFD
In PROFIBUS network, each device corresponds to a unique node address, you can use the node
address selection switch to define node address, but you cannot adjust the parameter by youself and
the parameter is only used to display the node address.
4. GSD file
In PROFIBUS network, each PROFIBUS subsidiary station needs GSD file "device description
document" which used to describe the characteristics of PROFIBUS-DP devices. GSD file contains all
defined parameters, including baud rate, information length, amount of input/output data, meaning of
diagnostic data.
A CD-ROM will be offered in which contains GSD file of the EC-TX-103 communication card
(extension name is .gsd) for fieldbus adapter. Users can copy GSD file to relevant subdirectory of
configuration tools, please refer to relevant system configuration software instructions to know
specific operations and PROFIBUS system configuration.

A.2.8 PROFIBUS-DP communication

1. PROFIBUS-DP
PROFIBUS-DP is a distributed I/O system, which enables master machine to use a large number of
peripheral modules and field devices. Data transmission shows cycle: master machine read input
information from subsidiary machine then give feedback signal. EC-TX-103 communication card
supports PROFIBUS-DP protocol.
2. Service access point
PROFIBUS-DP has access to PROFIBUS data link layer (Layer 2) services through service access
point SAP. Every independent SAP has clearly defined function. Please refer to relevant PROFIBUS
user manual to know more about service access point information. PROFIDRIVE - Variable speed
drive adopts PROFIBUS model or EN50170 standards (PROFIBUS protocol).
3. PROFIBUS -DP information frame data structure
PROFIBUS-DP bus mode allows rapid data exchange between master station and VFD. Adopting
master-slave mode dealing with VFD access, VFD is always subsidiary station, and each has definite
address. PROFIBUS periodic transmission messages use 16 words (16 bit) transmission, the
structure shown in the following figure.
PKW1
Parameters area:
PKW1-Parameter identification
PWK
PKW2 PKW3 PKW4
PZD
Fixed
Free distribution area
area
CW PZD3
PZD2
SW PZD3
PZD2
246
Extension card
PZD12
......
PZD12