Functions; Function Block Diagram - Mitsubishi Electric MELSERVO-J2-Super Series Instruction Manual

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) AJ61BT11
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) Twisted pair
cable
(3-wire type)
Operation mode
Test operation mode
Servo amplifier
Input
Output