YASKAWA MP920 User Manual page 256

Appendix B 218IF Messages
B.1.2 MEMOBUS Binary Mode
Single Holding Register Change
Command
7 0
(L)
Length: 07H
(H)
MFC: 20H
SFC: 06H
CPU No.
(H)
Reference No.
(L)
(H)
Register data
(L)
Response
7 0
(L)
Length: 07H
(H)
MFC: 20H
SFC: 06H
CPU No.
(H)
Reference No.
(L)
(H)
Register data
(L)
Loopback Test
Command
7 0
(L)
Length: 07H
(H)
MFC: 20H
SFC: 08H
CPU No.
Test code
0000H
Data
AAAAH
Response
7 0
(L)
Length: 07H
(H)
MFC: 20H
SFC: 08H
CPU No.
Test code
0000H
Data
AAAAH
Set the command length.
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.
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 address of the changed single holding register is returned.
The changed single holding register contents is returned.
Set the command length.
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.
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.
If the test is completed normally, the same data will be returned
as for the command.
B-8