General-Purpose Messages; B.3.1 Message Configuration - YASKAWA MP920 User Manual

Appendix B 218IF Messages

B.3.1 Message Configuration

B.3

General-purpose Messages

B.3.1 Message Configuration
When the no-protocol mode is set as the communications protocol, application data can be
handled as general-purpose messages.
When data is sent and received, each message consists of two elements: A header and appli-
cation data.
Header
TCP/IP header
The part shown by the dotted lines can be handled only by the 218IF.
The header is used for TCP/IP and UDP/IP. The user program need not be aware of this
header because it is automatically added or deleted by the 218IF.
The format of the application data can be freely set. The operation codes have the message
structure shown below, according to the code that is set in the connection parameter.
No. Communications
Protocol
1 No protocol
2 No protocol
The difference from the general-purpose message mode of the Extended MEMOBUS proto-
col is that the EIF header may or may not be added in front of the application data.
List of General-purpose Message Commands
These commands are freely set by the application.
Application data

General-purpose messages:

Only this part is handled by the application program.
Code Reference
Binary B.3.2
ASCII B.3.3
B-26