Operation - Mitsubishi Electric FR-A5NR Instruction Manual

COMPUTER LINK FUNCTION

4.7 Operation

(1) General operation
1) The computer CPU decodes and executes the user program.
2) Communication data in accordance with the user program is converted into serial signals in the com-
puter and is then converted at the interface level conforming to the RS-422 or RS-485 standard, then
transmitted to the inverter by the driver.
3) The communication data is received by the receiver in the FR-A5NR unit, converted into parallel signals
by the communication LSI, and transmitted to the inverter CPU.
4) The inverter CPU checks the data for errors, processes the data in accordance with the check result,
and creates reply data.
5) The reply data is converted into serial signals by the communication LSI in the FR-A5NR unit and is
then converted at the interface level conforming to the RS-422 or RS-485 standard, then returned to
the computer.
6) The reply data is received by the receiver in the computer, read and checked in accordance with the
user program.
(2) Function block diagram
Computer
User program
10 OPEN
20 ONCOMS
1)
30 GOSUB
CPU
6)
Driver
2)
5)
Receiver
FR-A5NR
Receiver
RDA
RDB
3)
Driver
SDA
4)
SDB
SG
Power
supply
21
Inverter
Data bus
Inverter
CPU