Toshiba V Series - Computer Link Protocol Transmission

64 Ethernet module User’s Manual
Chapter 5 Computer Link Protocol and the PC Link Protocol Transmission
5
5.1 Computer Link Protocol Transmission
Toshiba developed the T series computer link protocol transmission for use in controlling
the PROSEC-T Series programmable controllers. A host computer is able to used the
following functions using this procedure with respect to the S controller:
When the S controller and the host computer communicate over an EN311 using the
computer link protocol, they use UDP/IP as the transmission protocol.
The host computer sends commands and data from its own UDP socket(Socket: A
combination of an IP address and a port number) to the EN311 message transmission
UDP socket.
When the S controller uses computer link protocol transmission, it simply performs the
following as described in Chapter 4:
• Parameter setup (IP address and the UDP port number for message transmission)
and
• Operating mode control (message transmission permission)
There is no need to create any special user programs on the S controller.
See the "T Series Computer Link Operation Manual" (UM-TS03***-E008)" for details on
the functions, specifications, and usage of T series computer link protocol transmission.
Function Description
1 Reading the status Reads the status form the S controller.
2 Reading the register/device Reads the register/device data from the S controller
3 Writing the register/device Writes the register/device data into the S controller
4 Reading the calendar/clock Reads the calendar/clock data from the S controller
5 Writing the calendar/clock Writes the calendar/clock data into the S controller
6 Test text Performs the loop test between the host machine and the S
controller
Usage Recommendations
• Since UDP/IP does not provide control functions to guaranteed communication reliability,
higher level protocols (such as retry) are required.
• No processing is performed if a computer link protocol transmission message is received at
any point other than a message transmission UDP socket.