Supplementary Explanation of Communication Function
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About communication protocol
The communication protocol of the inverter conforms to MEWTOCOL-COM, however, there are
some differences as below.
(For the details on the protocol, refer to our PLC manual.)
(1) It does not support multiple frames.
(2) The usable commands are the following 11 types: RCS, RCP, WCS, WCP, RCC, WCC, RD,
WD, MC, MD and MG.
(Max. reading
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writing point number and data of each command are shown in the table as below.)
(3) The data code when using WD and RD commands is "D" (data register).
(4) The contact code when using WC (S, P) and RC(S, P) commands is "R" (internal relay).
(5) Header supports "%" only.
(6) There is no distinction between data and setting areas in the internal memory of the inverter.
It can be treated as word data (16bit) and contact data (1bit) for the same address (region).
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Send/ receive changeover wait time
Set the wait time to the values larger than the values shown below after the response message
is sent by the inverter and before a host computer sends the next data.
Communication speed (bps)
Wait time (msec)
4800
2.0
1.0
0.5
9600
19200
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Processing time on inverter
The internal processing time of the inverter differs depending on the operating conditions, however
it is always below 50ms.
In the case of setting the parameter P42 (data setting clear), maximum 1.5s processing time is necessary
for writing data into the internal memory. When the timeout period is specified on the host computer,
the value which does not give any effect on the system must be set.
Host
computer
Transmission
data
Transmission
data
Processing
time
Processing
time
Send wait time
(Parameter P40)
Wait time
Inverter
Response
data
Response
data
Send wait time
(Parameter P40)
78
Command
code
Read single point of contact information
Content
Read plural point of contact information
Read word unit of contact information
Write single point of contact information
Write plural point of contact information
Write word unit of contact information
Read data area
Write data area
Registration and reset of monitor contact
Registration and reset of monitor data
Monitor execution
1 point
RCS
RCP
RCC
WCS
WCP
WCC
RD
WD
MC
MD
MG
Max. reading
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writing numbe
8 points
27 points
1 point
8 points
12 data
27 data
12 data
40 points
16 points
Contact: 40 points /
data: 16 data
