Instruction manual
129
4
PARAMETERS
7)Sum check code
The sum check code is 2-digit ASCII (hexadecimal) representing the lower 1 byte
(8 bits) of the sum (binary) derived from the checked ASCII data.
8)Error code
If any error is found in the data received by the inverter, its definition is sent back to
the computer together with the NAK code. (Refer to page 133.)
Note:1. When the data from the computer has an error, the inverter will not accept
that data.
2. Any data communication, e.g. run command, monitoring, is started when the
computer gives a communication request. Without the computer's command,
the inverter does not return any data. For monitoring, therefore, design the
program to cause the computer to provide a data read request as required.
3. When the parameter setting is read or written, the data of the link parameter
expansion setting changes depending on the parameter. For the data, refer to
the parameter instruction code list on page 196.
CAUTION
When the inverter's permissible communication time interval is not set,
interlocks are provided to disable operation to prevent hazardous
conditions. Always set the communication check time interval before
starting operation.
Data communication is not started automatically but is made only once
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 broken due to signal cable breakage, computer fault
etc, the inverter does not detect such a fault. This should be fully noted.
30
+
31
+
45
+
31
+
31
+
30
+
37
+
41
+
44
=
1F4
E
N
Q
1
01E1 07ADF4
H05 H30 H31 H31H45 H31 H30 H37 H41 H44 H46 H34
S
T
X
0117 0 30
H02 H30 H31 H37H31 H37 H30 H03 H33 H30
E
T
X
7
(Example 1)
Computer
→
inverter
ASCII code
→
(Example 2)
inverter
→
Computer
ASCII code
→
Station
number
Instruction
code
Data
Sum
check
code
H
HHHHHHHH
H
H
30
+
31
+
31
+
37
+
37
+
30
=
130
HH HHH
H
Station
number
Sum
check
code
Read time
←
Binary code
←
Binary code
Waiting
time
Sum
Sum
M4500E.book 129 ページ ２００５年２月２２日 火曜日 午後５時７分