YASKAWA MP920 User Manual page 257

Holding Register Read (Extended)
Command
7 0
(L)
Length: 08H
(H)
MFC: 20H
SFC: 09H
CPU No.
SPARE
(L)
Reference No.
(H)
(L)
No. of registers (n)
(H)
Response
7 0
Length: 06H+ (L)
No.of registers×2
(H)
MFC: 20H
SFC: 09H
CPU No.
SPARE
(L)
No. of registers (n)
(H)
(L)
Data 1
(H)
(L)
Data n
(H)
Set the command length.
Always 20H.
The SFC number is 09H when the holding register contents are
read.
Set 4 bits each for the destination CPU number and the source
CPU number.
Set the leading address of the holding registers to be read.
Set the number of holding registers to be read.
Set the command length.
Always 20H.
The same SFC number as that specified in the command is
returned.
Set 4 bits each for the destination CPU number and the source
CPU number.
The number of read holding registers is returned.
The holding register contents are returned.
B-9
B.1 Extended MEMOBUS Messages
B