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
0
1
E
1
0
7
A
D
F
4
H05
H30 H31
H31
H45 H31
H30 H37 H41 H44 H46 H34
S
T
X
0
1
1
7
0
3
0
H02
H30 H31
H37
H31 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
H
H
H
H
H
H
H
H
H
H
30
+
31
+
31
+
37
+
37
+
30
=
130
H
H
H
H
H
H
Station
number
Sum
check
code
Read time
←
Binary code
←
Binary code
W
a
iting
time
Sum
Sum
M4500E.book 129 ページ ２００５年２月２２日 火曜日 午後５時７分
Summary of Contents for M4000E series
Page 11: ...MEMO ...
Page 23: ...12 MEMO ...
Page 55: ...44 MEMO ...
Page 173: ...162 MEMO ...
Page 199: ...188 MEMO ...
