YASKAWA MP920 - Communications Protocols and Message Communications

3.1 Overview of Communications Protocols
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3.1.2 Communications Protocols and Message Communications
There are two message communications modes: The MEMOBUS message mode for com-
mand-response communications, and a general-purpose message mode for one-way commu-
nications.
The various communications protocols belong to either of these message communications
modes.
Message
Communications Mode
Communications
Protocols
Remarks
MEMOBUS Message
Mode
Extended MEMOBUS
MEMOBUS
MELSEC-A
OMRON
Command-response commu-
nications
General-purpose
Message Mode
No protocol
(Through mode)
One-way communications