Memobus Binary Mode - YASKAWA MP920 User Manual

B.1.2

MEMOBUS Binary Mode

This mode is the binary mode format for MEMOBUS message transmission.
Coil Status Read
Command
7
Length: 07H
MFC : 20H
SFC : 01H
CPU No.
Reference No.
No. of coils (n)
* 1. MFC: Major Function Code
* 2. SFC: Subfunction Code
Response
7
Length: 03H+
(No.of coils/8)
MFC: 20H
SFC: 01H
CPU No.
(Coils 1 to 8)
Coils (No.of coils)
0
(L)
Set the command length.
(H)
*1
Always 20H.
The SFC number is 01H when coil status is read.
*2
Set 4 bits each for the destination CPU number and the source
CPU number.
Set the leading address of the coils to be read.
(H)
(L)
(H) Set the number of the coils to be read.
(L)
0
Set the response length.
(L)
(H)
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.
(H)
(L)
The status of the read coils is returned.
(H)
(L)
B-5
B.1 Extended MEMOBUS Messages
B