Yaskawa MP920 Communications Module - Manual (Page 257)

Appendix B 218IF Messages
B.1.2 MEMOBUS Binary Mode
B-8
„ Single Holding Register Change
„ Loopback Test
MFC: 20H
SFC: 06H
Length: 07H
CPU No.
Set the command length.
Command
Always 20H.
The SFC number is 06H when a single holding register is written.
Set 4 bits each for the destination CPU number and the source
CPU number.
Set the address of the single holding to be changed.
Set the contents to be changed in the single holding registers.
(L)
(H)
Reference No.
Register data
(L)
(H)
(L)
(H)
7 0
MFC: 20H
SFC: 06H
Length: 07H
CPU No.
Set the command length.
Response
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 address of the changed single holding register is returned.
The changed single holding register contents is returned.
(L)
(H)
Reference No.
Register data
(L)
(H)
(L)
(H)
7 0
MFC: 20H
SFC: 08H
Length: 07H
0000H
AAAAH
CPU No.
Set the command length.
Command
Always 20H.
The SFC number is 08H with the loopback test.
Set 4 bits each for the destination CPU number and the source
CPU number.
Set the test data.
(L)
(H)
Data
Test code
7 0
MFC: 20H
SFC: 08H
Length: 07H
0000H
AAAAH
CPU No.
Set the command length.
Response
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.
If the test is completed normally, the same data will be returned
as for the command.
(L)
(H)
Data
Test code
7 0