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2 CC-Link IE FIELD NETWORK BASIC PROTOCOL
2.1 Description
2
CC-Link IE FIELD NETWORK BASIC
PROTOCOL
2.1
Description
In CC-Link IE Field Network Basic, a command that a master station (controller) sends to slave stations (servo amplifiers) is
called a request message, and a command that the slave stations (servo amplifiers) send back to the master station
(controller) is called a response message.
The master station (controller) sends the request message using the directed broadcast to all slave stations (servo amplifiers).
When the servo amplifier receives the request message, it acquires data for own station and returns the response message to
the master station (controller) using the unicast after the servo amplifier response time. The servo amplifier response time
differs depending on the command to be sent.
Link devices (RWr, RWw, RX, and RY) are used for data communication. The master station (controller) refreshes links by
sending and receiving the request and response messages at a constant cycle. The servo amplifier reads the received data
as an object dictionary to drive a servo motor and return monitor data.
2.2
Message format
The following shows the request message format to be used when the master station (controller) sends a message, and the
response message format to be used when the slave stations (servo amplifiers) return a message.
Messages are sent by using UDP/IP.
• Request message format
• Response message format
Constant cycle
Request message (directed broadcast)
Master station
(controller)
Slave station
(servo amplifier)
Response message (unicast)
Ethernet
CCIEF
Basic
UDP
IP
(RY, RWw)
Command,
etc.
Link device (for 16 stations)
header
header
header
header
Ethernet
CCIEF
Basic
UDP
IP
(RX, RWr)
Slave station
notification
information
Link device
header
header
header
header