Appendix B 218If Messages; Extended Memobus Messages; B.1.1 Message Configuration - YASKAWA MP920 User Manual

Appendix B 218IF Messages

B.1.1 Message Configuration

B.1

Extended MEMOBUS Messages

B.1.1 Message Configuration
The message configuration shown below is for messages used by the 218IF Module. Refer
to this when creating applications on a personal computer.
When data is transferred with the Extended MEMOBUS protocol, each message consists of
three elements: A header, a 218 header, and application data.
Header 218 header
TCP/IP header
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 218 header is required when the Extended MEMOBUS protocol is used by the 218IF.
The application program need not be aware of this 218 header because it is automatically
added or deleted by the 218IF.
The actual data for the Extended MEMOBUS protocol is stored in the application data.
When communications are performed between the 218IF and a host computer, the 218
header must be added or deleted by the application on the host computer.
The application data part has the parameter structure shown below, according to the code
that is used with the communications protocol.
No. Communications Protocol
1 MEMOBUS messages
2 MEMOBUS messages
3 General-purpose messages
(no protocol)
4 General-purpose messages
(no protocol)
Application data
MEMOBUS and general-purpose messages:
Only this part is handled by the application program.
218 header
Code
BIN
ASCII
BIN
ASCII
B-2
Reference
B.1.2
B.1.3
B.1.4
B.1.5