Using Fins Communications; Fins Communications By Ladder Program - Omron SYSMAC C200HW-PCU01 Operation Manual

Using FINS Communications

9-2

Using FINS Communications

9-2-1 FINS Communications by Ladder Program

1, 2, 3...
3. FINS commands to a PC Card Unit at the same Programmable Controller
are not transmitted to the Ethernet.
FA computer
A datagram is the unit of data handled by UDP/IP communications through the
port specified for UDP communications. A communications service using UDP/
IP normally allocates unique communications ports to run the service.
Note The UDP/IP protocol does not provide communications control to ensure com-
munications reliability. Consequently, the FINS communications services using
the UDP/IP protocols cannot guarantee that any message arrived safely and
unaltered at the destination. Methods such as arrival confirmation processing to
ensure reliability must be programmed into the user application.
This subsection outlines the methods for using FINS communications.
The processing flow for executing FINS communications from a ladder program
is explained below.
1. The CMCR instruction is used to issue a FINS command.
Datagram (FINS command)
Datagram (FINS response)
User program
FINS
command
Section 9-2
PC Card Unit
C200HX/HG/HE
PC Card Unit
117