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System Configuration
5
CC-Link COMMUNICATION
5.1.3 Function block diagram
How I/O data are transferred to/from the inverter in CC-Link will be described using
function blocks.
(1) Between the master station and inverter in the CC-Link system, link refresh is
always made at 3.5 to 18ms (512 points).
(2) I/O refresh and master station's sequence program are executed asynchronously.
(3) Data read from the inverter are read from the buffer memory of the CC-Link
system master/local module using the FROM instruction.
(4) Data to be written to the inverter are written to the buffer memory of the CC-Link
system master/local module using the TO instruction.
1) I/O signals assigned to the CC-Link system master/local module. These signals
are used to make communication between the PLC CPU and CC-Link system
master/local module.
2) Input data from the inverter can be read, and output data from the inverter can be
written. Buffer memory read/write is performed using the FROM/TO instruction of
the sequence program. Refer to page 148 for details of the buffer memory.
3) PLC link start is commanded from the sequence program. After PLC link has
started, link refresh is always made asynchronously with the sequence program
execution.
4) I/O data are transferred between the CC-Link system master/local module and
inverter CPU via the sequence program.
5) I/O data are transferred between the inverter CPU and sequence program. (5)
indicates the operation performed when CC-Link is not used, and is irrelevant to
1) to 4).)
REMARKS
Programs cannot be read/written via CC-Link communication.
CPU
Inverter
CC-Link module
4)
PLC CPU
1) CC-Link module
I/O signals
2) Buffer memory
read/write
Interface with PLC
Buffer
memory
CC-Link interface
3) CC-Link
dedicated
cable
CC-Link interface
Built-in sequence program
5)
I/O
data
Inverter CPU
Input signal
Output signal