Yaskawa MP920 Communications Module - Manual (Page 256)

B.1 Extended MEMOBUS Messages
B-7
B
„ Input Register Read
„ Single Coil Status Change
MFC: 20H
SFC: 04H
Length: 07H
CPU No.
Set the command length.
Command
Always 20H.
The SFC number is 04H when the input register contents are read.
Set 4 bits each for the destination CPU number and the source
CPU number.
Set the leading address of input the input registers to be read.
Set the number of input registers to be read.
(L)
(H)
Reference No.
No. of registers (n)
(L)
(H)
(L)
(H)
7 0
MFC: 20H
SFC: 04H
Length: 03H+
CPU No.
Data 1
Data n
(L)
(H)
(L)
(H)
(L)
(H)
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 status of the read input registers is returned.
7 0
No.of registers×2
MFC: 20H
SFC: 05H
Length: 07H
ON/OFF=FFH/00H
00H
CPU No.
Set the command length.
Command
Always 20H.
The SFC number is 05H when the status of a single coil is changed.
Set 4 bits each for the destination CPU number and the source
CPU number.
Set the address of the coil to be changed.
Set the status for the coils.
(L)
(H)
Reference No.
(L)
(H)
7 0
MFC: 20H
SFC: 05H
Length: 07H
ON/OFF=FFH/00H
00H
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 coil to be returned.
The status of the changed coil is returned.
(L)
(H)
Reference No.
(L)
(H)
7 0