Ethernet/Ip Communication - INVT Goodrive350 Series Operation Manual

Communication extension card
MAC-layer
packet header
14 bytes

5.4.3 EtherNet/IP communication

The EtherNet/IP communication card supports 16-word input/output. Figure 5-5 shows the
packet format for transmitting data with a VFD.
By using the 32 inputs/outputs, you can set the reference parameters of the VFD, monitor the
state values, transmit control commands, monitor the running state, and read/write the
function parameters of the VFD. For specific operations, see the following description.
Parameter zone:
PKW1––Parameter identification
PKW2––Array index number
PKW3––Parameter value 1
PKW4––Parameter value 2
Process data:
CW––Control word (transmitted from the master to a slave. For description, see Table 5-5.)
SW––State word (transmitted from a slave to the master. For description, see Table 5-8.)
PZD––Process data (user defined)
(The process data output from the master to a slave is a reference value, and the process data
input from a slave to the master is an actual value.)
PZD zone (process data zone): The PZD zone in a communication packet is designed for
controlling and monitoring a VFD. The master and slave stations always process the received
PZD with the highest priority. The processing of PZD takes priority over that of PKW, and the
master and slave stations always transmit the latest valid data on the interfaces.
CWs and SWs
Table 5-4 Structure of a UDP communication packet
IP-layer
packet
header
20 bytes
Parameter
identification
(PKW)
PKW1 PKW2 PKW3
Figure 5-5 Packet structure
UDP-layer
packet header
20 bytes
Process data
Fixed
zone
CW PZD2 PZD3
PKW4
PZD2 PZD3
SW
-60-
EtherNet/IP communication card
Valid data
0-1488 bytes
(PZD)
Distributable zone
PZD12
PZD12
Packet trailer
4 bytes