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SECTION 7
Using FINS Communications to Create Host Applications
This section provides information on communicating on Ethernet Systems and interconnected networks using FINS
commands. The information provided in the section deals only with FINS communications in reference to Ethernet Units.
FINS commands issued from a PLC are sent via the SEND(090), RECV(098), and CMND(490) instructions programmed
into the user ladder-diagram program. Refer to the CS/CJ-series Programmable Controllers Instructions Reference Manual
(W340) for further details on programming these instructions.
7-1 Overview of FINS Communications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
7-1-1 Communications On an Ethernet Network. . . . . . . . . . . . . . . . . . . . 160
7-1-2 Using the FINS/UDP and FINS/TCP Methods . . . . . . . . . . . . . . . . 161
7-1-3 FINS Communications Service Specifications for Ethernet . . . . . . 161
7-2 FINS Frames . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
7-3 FINS/UDP Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
7-3-1 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
7-3-2 Sending Commands from a Host Computer. . . . . . . . . . . . . . . . . . . 166
7-4 FINS/TCP Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
7-4-1 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
7-4-2 FINS/TCP Mode Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
7-4-3 Sending Commands from a Host Computer. . . . . . . . . . . . . . . . . . . 184
7-5 Maximum Transmission Delays: Writing/Reading to CPU Unit . . . . . . . . . . 192