Function Block Diagram - Mitsubishi Electric A800 Programming Manual

2.1.2

Function block diagram

The following function blocks explain the I/O information flow to and from the inverter in CC-Link.
• Link refresh between the master station of CC-Link system and the inverter is continuously performed at 3.5 to 18 ms (512
points).
• I/O refresh and the sequence program of the master station are executed asynchronously.
• Data read from the inverter is read from the buffer memory of the CC-Link system master/local module using FROM
instruction.
• Data to be written to the inverter is written to the buffer memory of the CC-Link system master/local module using TO
instruction.
CC-Link module I/O
1)
signals
Reading from/writing
2)
to the buffer memory
CC-Link dedicated
3)
cable
4) Sequence program
5) I/O information
NOTE
• Programs cannot be read or written via CC-Link communication.
POINT POINT
• The differences between the normal CC-Link communication (Pr.544 = "1, 2, 12, 14, 18, 24, or 28") and the CC-Link
communication with the PLC function (Pr.544 = "100, 112, 114, 118, or 128") are shown below.
Parameter read/write, monitor, operation commands,
etc. have been assigned in advance.
CC-Link master module
C P U
1)
2)
Buffer
memory
I/O signals assigned to the CC-Link system master/local module. These signals are for
communication between the programmable controller CPU and the CC-Link system master/
local module.
Information that is input to the inverter can be read, and output information can be written.
FROM/TO instruction of the sequence program enables reading from/writing to the buffer
memory. For details on the buffer memory, refer to
The PLC link start instruction is sent from the sequence program. After PLC link starts, link
refresh is continuously performed asynchronously with execution of the sequence program.
The sequence program exchanges I/O information between the CC-Link system master/local
module and the inverter CPU.
The CC-Link system master/local module and the inverter CPU exchange I/O information.
(When CC-Link is not used, only 5) is performed and 1) to 4) are not related to the operation.)
Inverter
Pr.544=0,1,12,14,18,24,28
FR-A8NC
I/O (RX, RY)
RW w RWr
Inverter
Input signal
3) 4)
5)
Output signal
page 66.
Inverter
Pr.544=100,112,114,118,128
I/O
FR-A8NC
(RX, RY)
User
RW w RWr
assignment
The user must assign parameters, monitors, etc. using sequence programs.
Other data read/write, etc. can be assigned freely as user areas.
*Operation and speed commands have been assigned in advance.
CC-Link communication
System configuration
Sequence
program
57
2