Delta RMC101 User Manual download pdf (Page 380)

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5.2.6.5 Omron CS1 and CV PLCs

5.2.6.5.1 Using Omron PLCs with the RMC ENET

Overview

The CS1 and CV families of PLCs from Omron Electronics Inc. can be used to control the RMC

over Ethernet. These PLCs require the ETN01 Ethernet Unit and use Omron's FINS protocol to

communicate with the RMC.

Note: Ethernet communication with the Omron PLCs requires RMC ENET firmware dated

20001023 or later.

Note: The documentation below assumes the user is familiar with Omron PLC programming,

and instead focuses on how to initiate reads and writes to an RMC.

The FINS protocol uses a three-stage addressing system: network address, node number, and

unit number. These three address elements have the following purposes:

• Network Address:

This value identifies the network on which the target node resides. The PLC looks up this number

in its Local and Remote Network Tables to determine which local unit number should be used to

send out the request. For Ethernet systems, typically only the Local Network Table is used to

map a network address (for example, 1) to the unit number on the ETN01 Ethernet Unit (for

example, 0). See your Omron PLC and/or CX-Programmer documentation for details on setting

up the Local and Remote Network Tables.

• Node Number:

This value identifies the node on the network given by the network address. For Ethernet

networks, this number must be converted to an IP address. This conversion is done by the

ETN01 Ethernet Unit. Three methods are available. In the Automatic Address Generation

method, the IP address is derived by combining the ETN01's IP Network Address (e.g.

192.168.0.0) with the Node Number (e.g. 5) to get an IP Address (e.g. 192.168.0.5). In the IP

Address Table method, each Node Number maps to an IP Address via an entry in an IP Address

Table. In the Combined method, the IP Address Table is used first, but if the Node Number is not

found in the table, then the Automatic Address Generation method is used. See the Omron

ETN01 Ethernet Unit manual for details on these methods.

• Unit Number:

This value identifies the unit number on the rack of the remote node identified by the Network

Address and Node Number.

The RMC does not require manually setting these values in the RMC. Only the IP address needs

to be set in the RMC; see RMC Ethernet IP Address Setup for details. See the discussion below

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