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5
FUNCTION OVERVIEW
5.1 Function block diagram
Using function blocks, this section explains I/O data transfer to/from an inverter in CC-Link:
• Link refresh is continuously executed between the master station and inverter in the CC-Link system at
intervals of 1.1ms to 141ms (per station).
1) I/O signals
2) Buffer memory
access
1) These are I/O signals assigned to the CC-Link system master/local unit. These signals are used for
communication between the programmable controller CPU and CC-Link system master/local unit.
Refer to page 56 for details of the signal.
2) Allows input data to be read, output data to be written, and a CC-Link faulty station to be read, etc. Buffer
memory is accessed by the FROM and TO instructions in the sequence program. (The FROM/TO
instruction is not needed when the automatic refresh function is used.) For full information on the buffer
memory, refer to the CC-Link system master/local unit manual.
3) CC-Link communication start command is given from the sequence program. After the CC-Link
communication starts, link refresh is always performed asynchronously (or synchronously) with execution
of sequence program.
For details, refer to the CC-Link system master/local unit manual.
42
Programmable controller
CC-Link system master/local unit
CPU
Buffer
memory
Inverter
FR-A7NC
3) CC-Link
dedicated
cable
Input
Output
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