Chapter 7 Automatic Sending/Receiving function (ASR)
Chapter 7
Automatic Sending/Receiving
function (ASR)
7.1 ASR
EH-ETH2 has ASR function. The detailed information is mentioned as follows.
7.1.1
Automatic data sending
An automatic sending function is a function to transmit the data of CPU module to other node. The outline of
this function is shown as Figure 7.1. If you choose a cyclic sending, you can use an automatic data sending
function. In case of the cyclic sending, you do not have to prepare user program for sending data from CPU
to buffer area of EH-ETH2.
Ethernet
Host computer
EH-ETH2
transmission area
transmission buffer
(C)
(D)
(A)
CPU module
(B)
(A) After the power ON, EH-ETH2 opens automatic sending connection (here after ASR connection) for
EH-ETH2 and host computer.
(B) After the connection opened, EH-ETH2 waits for a request from user program or cyclic timing. Then
EH-ETH2 reads designated data. Several kinds of I/O type can be set in the sending area. (1 connection is able
to handle up to 10 entry.)
(C) The designated area data is written in a buffer area of EH-ETH2.
(D) The data is sent to host computer.
Figure 7.1
Outline of automatic sending
The specification of automatic data sending is mentioned as below.
(1) ASR connection
A transmission route of TCP/IP is called connection. EH-ETH2 is able to handle up to 6 connections at the same
time. One connection can send and receive data.
7-1
