Hitachi Hidic EH-150 Applications Manual page 48

Preliminary Rev.03
Chapter 7
7.1 Automatic data transmission
EH-ETH has automatic transmission function. The detailed information is mentioned as follows.
7.1.1 Automatic sending
EH-ETH is able to send any data to a designated address of CPU or host PC. The outline of this function is
shown as fig. 7.1.1.1. This function has two modes, which are cyclic sending and event sending. In the
cyclic mode, data is sent every designated period, and in event mode, data is sent upon designated
condition. Users do not have to prepare ladder program for sending data from CPU to buffer area of EH-
ETH.
EH-CPU448
transmission area
(A). After the power ON, EH-ETH opens automatic sending connection (here after ASR connection) for EH-ETH
and host computer.
(B). After the connection opened, EH-ETH waits for a request from ladder program or cyclic timing. Then EH-
ETH 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-ETH.
(D). The data is sent to host computer.
The specification of automatic data sending is mentioned as below.
(1). ASR connection
A transmission route of TCP/IP is called connection. EH-ETH is able to handle up to 6 connections at the same
time. One connection can transmit and receive data.
Description in this manual might be modified without notice.
Automatic data transmission
EH-ETH
transmission buffer
(B) (C)
Fig. 7.1.1.1 Outline of automatic sending
Chapter 7 Automatic data transmission
(A)
7-1
Host computer
(D)
Ethernet