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MELSEC-F
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:
Header
Application data
Maximum of 2040 bytes
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
Ethernet
14 bytes
IP
20 bytes
TCP
20 bytes
2) In case of UDP/IP
Ethernet
(14 bytes)
IP
(20 bytes)
UDP
(8 bytes)
Содержание FX3U-ENET
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