YASKAWA MP920 User Manual page 263

Holding Register Write
Command
7 0
(L)
Length: 07H+
No.of registers×2
(H)
MFC: 20H
SFC: 10H
CPU No.
(H)
Reference No.
(L)
(H)
No. of registers (n)
(L)
(H)
Data 1
(L) (L)
n
(H)
(H)
Data n
(L)
Response
7 0
(L)
Length: 07H
(H)
MFC: 20H
SFC: 10H
CPU No.
(H)
Reference No.
(L)
(H)
No. of registers (n)
(L)
Error Response
Command
7 0
(L) If there is an error in the command message SFC, in the reference
Length
number, or in the number of data items, the Slave station will
(H)
return an error response message.
MFC: 20H
SFC: 01H to 33H
CPU No.
Message Body
(L)
n
(H)
Response
7 0
(L) Error codes:
Length: 04H
01: SFC error
(H)
02: Reference number error
MFC: 20H
03: Error in the number of data items
SFC: SFC + 80H
CPU No.
Error code
B-15
Set the command length.
Always 20H.
The SFC number is 10H when holding registers are written.
Set 4 bits each for the destination CPU number and the source
CPU number.
Set the leading address of the holding registers to be written.
Set the number of holding registers to be written.
Set the status of the holding registers to be written.
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 leading address of written holding registers is returned.
The number of written holding registers is returned.
B.1 Extended MEMOBUS Messages
B