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3. CC-LINK COMMUNICATION FUNCTIONS
3.3 Functions
3.3.1 Function block diagram
This section explains the transfer of I/O data to/from the servo amplifier in CC-Link, using function blocks.
(1) Between the master station and servo amplifier in the CC-Link system, link refresh is normally performed at
intervals of 3.5 to 18ms (512 points). The link scan time of link refresh changes with the communication
speed. For details, refer to the CC-Link system master/local unit user's manual.
(2) The I/O refresh and master station sequence program are executed asynchronously. Some PLCs allow link
scans to be synchronized with PLC scans.
(3) The FROM instruction from the buffer memory of the CC-Link system master/local unit is used to read data
from the servo amplifier, and the TO instruction is used to write data. Some PLCs allow automatic refresh to
be set to omit the FROM and TO instructions.
1) QJ61B11N
I/O signal
2) Buffer memory access
3.3.2 Functions
The following table lists the functions that may be performed from the PLC in the CC-Link system in the CC-
Link operation mode or test operation mode.
Item
Monitor
Operation
Parameter write
Parameter read
Point table data write
Point table data read
PLC CC-Link unit
CPU
Buffer
memory
CC-Link operation mode
3 - 7
3) CC-Link
Ver.1.10-
compliant
cable
Operation mode
Test operation mode
Servo amplifier
Input
Output
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