2.6 Communications with a Mitsubishi PLC (A-compatible 1E Frame protocol)
Message Functions
2-123
Note: When communicating with TCP, the data size limit is the maximum size of data that can be sent in a single seg-
ment.
A segment is the unit for data transfer in TCP and is determined by the MTU (maximum transfer unit).
The data size setting ranges given above are for an MTU of 1,500 bytes.
Remote CPU Module Number (PARAM18)
This parameter is not used for the A-compatible 1E Frame protocol.
Reserved for System (PARAM19)
This parameter is used by the system.
Local Station Data Address (PARAM20 and PARAM21)
Set the address of the read data destination or write data source in the MP3000-series Controller.
The address is set as the word offset from address 0.
08 hex 16 hex Performs a loopback test.
−
0E hex 05 hex
Sets/resets word devices in units of one point by
specifying a device number.
1 to 40 points
31 hex 60 hex Writes to a fixed buffer in units of one word.
See the following table.
32 hex 61 hex
Reads from the random access buffer in units of
one word.
33 hex 62 hex
Writes to the random access buffer in units of
one word.
Function Connection Type Code Data Size Setting Range
Writing to a fixed buffer in units of one word
TCP
BIN 1 to 727 words
ASCII 1 to 362 words
UDP
BIN 1 to 1,017 words
ASCII 1 to 508 words
Reading from the random access buffer in units
of one word
TCP
BIN 1 to 728 words
ASCII 1 to 363 words
UDP
BIN 1 to 1,017 words
ASCII 1 to 508 words
Writing to the random access buffer in units of
one word
TCP
BIN 1 to 726 words
ASCII 1 to 361 words
UDP
BIN 1 to 1,017 words
ASCII 1 to 508 words
Do not change the value of PARAM19 from a user program or by any other means.
Continued from previous page.
Function
Code
Common
Instructions for
MELSEC
ACPUs
Function Data Size Setting Range
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