Yaskawa MP2300S Basic Module - Manual (Page 392)

Appendix G MSG-SND/MSG-RCV Functions (Ethernet)
G.1 Message Transmit Function (MSG-SND)
A-70
( 8 ) Data Size (PARAM06)
Set the data size (number of bits or words) for the read/write request.
Be sure that the last data address determined based on the offset, data address, and data size does not go beyond the
scope of the data addresses.
The range of data addresses may differ, depending on the function code and communication device.
The following table gives the valid ranges of data sizes when using MELSEC as a protocol.
Note: The restricted data size when using TCP is the maximum size transmitted using one segment.
The segment size is determined by MTU (maximum transfer unit) as a TCP data transfer unit.
The valid range of data sizes mentioned above is for MTU = 1500 bytes.
Table G.9 Valid Range of Data Sizes
Function Code
MELSEC
ACPU
Common
Command
Function
Valid Range of Data Sizes
Ethernet(218IF) Ethernet(218IFA)
01H/02H 00H Reads bit device in units 1 to 256 units
03H/04H/
09H/0AH
01H Reads word device in units 1 to 256 units
05H/0FH 02H Writes to bit device in units 1 to 256 units
06H/0BH/
10H
03H Writes to word device in units 1 to 256 units
08H 16H Loopback test –
0EH 05H
Specifies a device number for each word device at
random and sets/resets each word device
1 to 40 units
31H 60H Writes to the fixed buffer in words
See the table below. 32H 61H Reads from the random access buffer in words
33H 62H Writes to the random access buffer in words
Function
Valid Range of Data Sizes
Connection Type Code Ethernet(218IF) Ethernet(218IFA)
Writes to the fixed buffer in words
TCP
BIN 1 to 507 words 1 to 727 words
ASCII 1 to 362 words 1 to 362 words
UDP
BIN 1 to 507 words 1 to 1017 words
ASCII 1 to 507 words 1 to 508 words
Reads from the random access buffer in
words
TCP
BIN 1 to 508 words 1 to 728 words
ASCII 1 to 363 words 1 to 363 words
UDP
BIN 1 to 508 words 1 to 1017 words
ASCII 1 to 508 words 1 to 508 words
Writes to the random access buffer in
words
TCP
BIN 1 to 507 words 1 to 726 words
ASCII 1 to 361 words 1 to 361 words
UDP
BIN 1 to 508 words 1 to 1017 words
ASCII 1 to 508 words 1 to 508 words