72 Ethernet module User’s Manual
Chapter 5 Computer Link Protocol and the PC Link Protocol Transmission
5
5.3 PC Link Protocol Transmission (Data write)
The T series PC link protocol allows a local S controller to write register data to another S
controller/T3H/T2N on a network.
As is the case with the computer link protocol, the PC link protocol uses UDP/IP as its
transmission protocol.
The PC link main station uses a UDP socket for message transmission and transmits to
the slave station EN311 message transmission UDP socket. The user program that runs
on the main station is discussed later.
When this function is used on the PC link slave station, the S controller simply performs
the following as described in Chapter 4:
• Parameter setup and
• Operating mode control (message transmission permission)
There is no need to create any special user programs on the S controller.
Usage Recommendations
• Since UDP/IP does not provide control functions to guarantee communication reliability,
higher level protocols (such as retry) are required.
• No processing is performed if a PC link protocol transmission message is received at any
point other than a message transmission UDP socket.
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