INVT Goodrive300 Series Operation Manual page 242

Goodrive300 Series VFD
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 structures
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 figure1.
PKW 1
Parameters area:
PKW1-Parameter identification
PKW2-array index number
PKW3-parameter value 1
PKW4-parameter value 2
Process data:
CW-Control word (from master to slave)
SW-state word (from slave to master)
PZD-process data (decided by users)
(From master to slave output 【given value】, from slave to master input【actual value】)
PZD area (process data area):
PZD area of communication message is designed for control and monitor VFD. PZD from master and
slave station is addressed in high priority; the priority of dealing with PZD is superior to that of PKW,
and always sends current valid date from interface.
Control word (CW) and state word (SW):
Control word (CW) is a basic method of fieldbus system controlling VFD. It is sent by the fieldbus
master station to VFD and the EC-TX-103 communication cards act as gateway. VFD responds
according to the control word and gives feedbacks to master machine through state word (SW).
Given value: VFD can receive control information by several ways, these channels include: analog
and digital input terminals, VFD control board and module communication (such as RS485,
Parameter
identification (PKW)
PKW2 PKW3 PKW4
Process data (PZD)
Fixed Free distribution
area
CW PZD 2 PZD3
SW PZD 2 PZD3
237
Extension card
area
PZD12
...
PZD12