YASKAWA MP920 - MEMOBUS RTU Mode

B.2 MEMOBUS Messages
B-19
B
 List of MEMOBUS Commands
The commands that make up the MEMOBUS messages are identified by a function code,
and have the functions shown in the following table.
B.2.2 MEMOBUS RTU Mode
 Coil Status Read
Function Code Function MEMOBUS
(RTU)
MEMOBUS
(ASCII)
01H Coil status read 2,000 points 976 points
02H Input relay status read 2,000 points 976 points
03H Holding register write 125 words 61 words
04H Input register read 125 words 61 words
05H Single coil status change 1 point 1 point
06H Single holding register write 1 word 1 word
08H Loopback test
−−
0FH Multiple coil status change 800 points 800 points
10H Multiple holding register write 100 words 59 words
The function code is 01H when the coil status is read.
Set the leading address of the coils to be read.
Set the number of coils to read.
Error check
Slave address
Function code: 01H
Start No.
No. of colis
CRC-16
(L)
(H)
(L)
(H)
(L)
(H)
Command
70
Slave address
Function code: 01H
No. of data items
Status of first 8 coils
Status of next 8 coils
Status of next 8 coils
CRC-16
(L)
(H)
The function code is 01H when the coil status is read.
The byte length of the read data is returned.
The read data contents are returned.
Error check
Response
70