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MELSEC-F
FIXED BUFFER COMMUNICATION (WITH THE PROCEDURE EXIST
CONTROL METHOD)
6
6 - 8
6.4 Data Format
When communicating between the Ethernet module and an external device, the data
format explained below is used.
The communication data consists of a "header" and "application data" as follows:
6.4.1 Header
The header for TCP/IP or UDP/IP is used. In case of the Ethernet module, the
Ethernet module adds and deletes the header. Thus, the user does not need to set it.
(Details of the size of the header section)
1) In case of TCP/IP
2) In case of UDP/IP
Header Application data
Maximum of 2040 bytes
Ethernet
14 bytes
IP
20 bytes
TCP
20 bytes
Ethernet
(14 bytes)
IP
(20 bytes)
UDP
(8 bytes)