Hitachi Hidic EH-150 Applications Manual page 65

Preliminary Rev.03
7.3.2 Optional data receiving
This function is valid only when ASR connection is selected as receiving function, which is set in Web page
by checking
For further understanding the optional receiving, the procedure of disabled optional receiving is described at
first as below.
- Optional receiving disable
Sending is controlled automatically. User program is not required.
(A) EH-ETH receives data from another station and stores it in its buffer.
(B) EH-ETH sends the data to designated data area.
- Optional receiving
Received data in CPU is refreshed only when EH-ETH receives a certain command from user program, otherwise
EH-ETH sends previous data cyclically to CPU. The outline of CPU and EH-ETH is shown in Fig.7.3.2.2, and the
time chart is shown in Fig. 7.3.2.3.
(A) EH-ETH receives data from another station and stores it in receiving buffer.
(B) If EH-ETH receives a request to refresh command (X), EH-ETH will send designated data. Otherwise EH-
ETH sends the previous data to CPU cyclically.
(X) CPU (user program) send a request "Send data to CPU" to EH-ETH.
- Description in this manual might be modified without notice.
at "Receive" in "Usage" in "ASR Connection (No. n) Setting".
EH-CPU448
Receiving area
Ethernet
Fig. 7.3.2.1 Automatic receiving (Optional receiving disabled)
EH-CPU448
Received area
Ethernet
Fig. 7.3.2.2 Automatic receiving (Optional receiving enabled)
Chapter 7 Automatic data transmission
EH-ETH
Receiving buffer
(B)
(A)
Description
EH-ETH
Received buffer
(X)
(B)
(A)
Description
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