Yaskawa MP920 Communications Module - Manual (Page 264)

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