Fins Commands - Omron CJ - REFERENCE MANUAL 07-2009 Reference Manual

FINS Commands

3-1 FINS Commands
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FINS commands form a command system for message services across differ-
ent OMRON networks. They can be used for various control operations, such
as sending and receiving data, changing operating modes, executing forced
set and forced reset operations, performing file operations, and so on. FINS
commands make it possible to freely communicate with Units in various net-
works and on CPU Racks by simply specifying the network, node, and unit.
FINS commands have the following features:
1. They are defined in the application level and do not depend on lower levels
(i.e., the physical and data link levels). This allows them to be used across
a variety of networks and CPU buses. Specifically, they can be used with
Ethernet, Controller Link, and Host Link networks, and between CPU Units
and CPU Bus Units.
Note FINS commands can be sent with UDP/IP headers when using
Ethernet and with Host Link command headers when using Host
Link.
2. FINS commands can be used to access various kinds of devices besides
CPU Units. Devices such as CPU Units, CPU Bus Units, personal comput-
ers (boards), and Inner Boards can be identified and specified by their unit
addresses.
CPU Bus Unit
Inner Board
3. FINS commands support network relay operations, so they can pass
through a network hierarchy to access devices on up to three network lev-
els (including the local network).
Network 1
Note With CS/CJ-series CPU Units with unit version 2.0 or later, CP-series CPU
Units, or NSJ Controllers, devices can be accessed on up to 8 network levels.
When the destination of a FINS command is a CPU Unit, the command can
be sent through as many as 8 network levels. When the destination of a FINS
command is a node other than a CPU Unit, the command can be sent through
a maximum of 3 network levels.
CPU Unit
Network 2
Section 3-1
Personal computer board
Network 3