Mitsubishi Electric FR-A520-0.4K-NA Instruction Manual page 131

Instructions for the program
(1) When the operation mode is switched to communication operation.
(2) Since any data communication, such as operation command or monitoring, is always requested by the
computer, the inverter will not return data without the computer's request. Hence, design the program so
that the computer gives a data read request for monitoring, etc. as required.
(3) Program example
When the operation mode is switched to communication operation
When the inverter's communication check time interval is not set, interlocks are provided to
disable operation to prevent hazard. Always set the communication check time interval
before starting operation.
Data communication is not started automatically but is made only when the computer
provides a communication request. If communication is disabled during operation due to
signal cable breakage etc, the inverter cannot be stopped. When the communication check
time interval has elapsed, the inverter will come to an alarm stop (E.PUE).
The inverter can be coasted to a stop by switching on its RES signal or by switching power
off.
If communication is halted due to signal cable breakage, computer fault etc., the inverter
does not detect such a fault. This should be fully noted.
10 OPEN "COM1: 9600, E, 8, 2, HD" AS#1
20 COMST1, 1, 1: COMST1, 2, 1
30 ON COM (1) GOSUB*REC
40 COM (1) ON
50 D$= "01FB10002"
60 S=0
70 FOR I=1 TO LEN (D$)
80 A$=MID$ (D$, I, 1)
90 A=ASC (A$)
100 S=S+A
110 NEXTI
120 D$=CHR$ (&H5) +D$+RIGHT$ (HEX$ (S) , 2)
130 PRINT#1, D$
140 GOTO 50
1000 *REC
1010 IF LOC (1)=0 THEN RETURN
1020 PRINT "RECEIVE DATA"
1030 PRINT INPUT$ (LOC (1) , #1)
1040 RETURN
General flowchart
Line number
10
Input file
initial setting
40
50
Transmission data
processing
{
Data setting
{
Sum code calculation
{
Data transmission
140
Initial setting of I/O file
: Communication file
opening
: Circuit control signal
(RS, ER) ON/OFF setting
: Interrupt definition at
data receive
: Interrupt enable
Transmission data setting
Sum code calculation
: Addition of control and
sum codes
Data transmission
Interrupt data receive
: Interrupt occurrence at
data receive
1000
Receive data processing
{
Interrupt
Data import
{
Screen display
1040
CAUTION
119
PARAMETERS