Chapter 7 Functions; Cyclic Transmission; Data Flow And Link Device Assignment - Mitsubishi Electric CC-Link IE Basic Reference Manual

7
FUNCTIONS
This chapter describes the functions of CC-Link IE Field Network Basic.
When the C Controller module is used, refer to the following.
MELSEC iQ-R C Controller Module User's Manual (Application)
7.1

Cyclic Transmission

This function periodically performs data communication between the master station and slave stations using link devices.

Data flow and link device assignment

The following figure shows the data flow of communications using link devices between the master station and slave stations.
X0
Master station
Device
Ø
Link
refresh
Device
Ó
Link
refresh
M0
Ò
Y
: Area where data is sent to other stations
*1 The slave station order is the same as the order set in the network configuration setting. ( Page 35 Network Configuration Settings)
• Output from the master station
 The devices of the master station turn on.
 The status of the devices of the master station is stored in the link devices (RY, RWw) of the master station by link refresh.
 The status of link devices (RY, RWw) of the master station is stored in the link devices (RY, RWw) of each slave station by link scan.
 The status of the link devices (RY, RWw) of the slave station is output to external devices.
• Input from the slave station
 The status of external devices is stored in the link devices (RX, RWr) of each slave station.
 The status of the link devices (RX, RWr) of each slave station is stored in the link devices (RX, RWr) of the master station by link scan.
 The status of the link devices (RX, RWr) of the master station is stored in the devices of the master station by link refresh.
 The devices of the master station turn on.
7 FUNCTIONS
22
7.1 Cyclic Transmission
Ù
RX, RWr
Slave
×
station 1
Slave
×
station 2
Slave
×
station 3
Link
scan
RY, RWw
Slave
Ô
station 1
Slave
Ô
station 2
Slave
Ô
station 3
*1
Slave station 1 Slave station 2
RX, RWr
RX, RWr
RY, RWw
RY, RWw
*1 *1
Slave station 3
RX, RWr
RY, RWw
Ö
Õ