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2. CC-Link IE FIELD NETWORK BASIC PROTOCOL
2. CC-Link IE FIELD NETWORK BASIC PROTOCOL
2.1 Summary
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 send.
Use link devices (RWr, RWw, RX, and RY) for data communications. Sending and receiving the request
message and response message at a constant cycle allow the master station (controller) to perform link
refresh.
The servo amplifier reads the received data as an object library 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.
(1) Request message format
IP
Ethernet
header
header
(2) Response message format
IP
Ethernet
header
header
Master station
(controller)
CCIEF
UDP
Command,
Basic
header
etc.
header
Slave
CCIEF
UDP
station
Basic
header
notification
header
information
Constant cycle
Request message (directed broadcast)
Response message (unicast)
Link device (for 16 stations)
2 - 1
Slave station
(servo amplifier)
(RY, RWw)
Link device
(RX, RWr)
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