Specifications

11
BCN-B11127-478*
4.3 Functions
4.3.1 Function block diagram
This section explains the transfer of I/O data to/from the servo amplifier in PLC 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 module 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 module 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) AJ61BT11
I/O signal
CPU
Buffer
memory
2) Buffer memory access
3) Twisted pair
cable
(3-wire type)
Input
Output
Servo amplifier
PLC CC-Link module
PLC CPU
Interface with PLC
CC-Link interface CC-Link interface
I/O interface
Servo amplifier CPU
4.3.2 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 parameter unit test operation mode.
Operation mode
Item
CC-Link operation mode Parameter unit test operation mode
Monitor
Operation
Parameter write
Parameter read
Position block data write
Position block data read