YASKAWA IM 053MT Manual page 74

Deployment
Modbus function codes
Respond telegram
Modbus/TCP-Header
x x 0 0 0
6byte
Write n words and Read m
words 17h
Command telegram
Modbus/TCP-Header
x x 0 0 0
6byte
Respond telegram
Modbus/TCP-Header
x x 0 0 0
6byte
74
Slave address Function code
8
1byte
Code 17h: This function allows to write n words to the master output area 4x and read m
words from the master input area 3x with one request.
Slave Function Read
address code address
1byte 1byte
Slave Function
address code
1byte 1byte
Address word
1byte 1word
Read Write
number address
words
1Wort 1Wort 1word
Read number
bytes
1byte
AND Mask
1word
Write Write Write
number number Data
words bytes 1.word
1word 1byte 1word
Read Data 1. Read Data 2.
word word
1word 1word
max. 126words
HB300 | IM | 053-1MT01 | en | 19-40
VIPA System SLIO
OR Mask
1word
Write ...
Data
2.word
1word
max. 122words
...