2.7 Communications with a Mitsubishi PLC (QnA-compatible 3E Frame Protocol)
Using the MSG-SNDE Function with the MP3000 as the Master
2-149
Ethernet Communications
Transfer Size
The following table lists the size of data that can be transferred using the MSG-SNDE function. Use the
data size within the ranges listed in the following table according to the conditions of the Mitsubishi Q/
QnA-series PLC slave.
The upper limit on the data size will also depend on the MEMOBUS function code that is specified in the
MSG-SNDE function.
Refer to the following section for details on the data size parameter in the MSG-SNDE function.
Data Size (PARAM17) (page 2-169)
Setting Example
The following figure illustrates how the contents of 800 bits (50 words) from the MB005120 to
MB00561F hold registers in the MP3000 master are written to the 000000 to 000799 internal M relays in
the CPU Unit of the Mitsubishi Q/QnA-series PLC slave.
QnA-compatible 3E Frame
(Hex)
Meaning
Data Size
Command
Subcommand
218IFD
0401
0001
Reads bit devices in units of one point.
1 to 2,000 points
0401
0000
Reads word devices in units of one point.
1 to 960 points
1401
0001
Writes bit devices in units of one point.
1 to 800 points
1401
0000
Writes word devices in units of one point.
1 to 960 points
0403
0000
Reads word devices in units of one point.
1 to 192 points
1402
0000
Writes word devices in units of one point.
1 to 160 points
UDP
ASCII
Ethernet
Ethernet
Ethernet
MB005120 to F
B005130 to F
MB005610 to F
MB005600 to F
000000
000001
000799
000798
MP3000
(local station)
Port number: 5010
Local Station
Hold registers (M registers)
Written.
Remote Station
Internal Relays (M)
Port number: 5011
Master
Data size:
50 words
Data size:
50 words
Slave
Communications Protocol QnA-compatible 3E Frame
Connection Type
Data Code
Mitsubishi MELSEC
Q/QnA-series PLC
(remote station)