Data Format; Header - Mitsubishi Electric FX3U-ENET User Manual

6 FIXED BUFFER COMMUNICATION (WITH THE PROCEDURE EXIST
CONTROL METHOD)

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)
6 - 8
Header Application data
Maximum of 2040 bytes
1) In case of TCP/IP
Ethernet
14 bytes
2) In case of UDP/IP
Ethernet
(14 bytes)
IP
20 bytes
IP UDP
(20 bytes) (8 bytes)
MELSEC-F
TCP
20 bytes
6 - 8