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PARAMETERS
115
(5) Instructions for the program
1) If the data from the computer is in error, the inverter will not accept that data. Hence, always insert a data-
error retry program in the user program.
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
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
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
Receive data processing
$
Data import
$
Screen display
General flowchart
Line number
10
40
50
140
I/O file
initial setting
Transmission data
processing
$
Data setting
$
Sum code calculation
$
Data transmission
Interrupt
1000
1040
to
to to
CAUTION
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.
4