2-22
Send processing
Reception processing
(5)
(6)
(7)
(8)
(9)
(4)
Reception completion processing
Step Description
(1) The fixed portion of the connection process is set. This processing is performed once at startup.
(2) The connection is open after the initialization process is completed.
(3) A communications refresh timer of 300 ms is started. This performs the first sending after 300 ms.
(4)
Once 300 ms has elapsed, the reception completion bit (M40) is checked, and receive
processing is performed if data has been received. A send command from the Standard PLC is
initially required, and so reception processing is performed after completing the first send.
(5) Set the FINS data to the sending command.
(6) Set the “G9SP communication reception data” to X100 of sending command and set the “Echo back
bit” and transfer to Ethernet port. By this flow, the sending command is transfered to the G9SP series.
(7) The timer is restarted and the next receive processing is performed after 300 ms.
(8) The ZB.BUFRCV instruction is executed because the reception response is stored to D500.
(9) The checksum of the reception response and the end code are checked, and the G9SP Comm-
unications Transmission Data is copied to Y200 and G9SP Safety Input Terminal Data is copied to
Y220.
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