Drivers Omron Modems

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Reference designs covering essential system elements for millions of products are available at arrow.com. Search our extensive library today. The easiest way is to use the Omron Serial Autodetect Wizard. Using the options you select, the wizard will try different settings to work out the correct Fernhill SCADA configuration. Manually configure Fernhill SCADA and the CS/CJ Serial Port to use the same communication options.

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Introduction

Omron PLC Devices can support Ethernet connections in a variety of ways:

  • Some compact PLC Devices have a built in Ethernet port, for example the CP1L-EL20DT1-D.
  • Compact PLC Devices without an Ethernet port, can be fitted with the CP1W-CIF41 Ethernet option board.
  • Some modular and rack mounted CPU units have a built in Ethernet port, for example the CJ2M-CPU35.
  • Modular and rack mounted PLC Devices can be fitted with an Ethernet module, for example the CJ1W-ETN21.

When connected to an Ethernet network the FINS protocol is used to communication with Omron PLC Devices. The FINS protocol can be used in one of two ways:

  • FINS/UDP. Supported by all Ethernet connection types.
  • FINS/TCP. Not supported on some earlier Ethernet modules, for example the CS1W-ETN11.

The rest of this article describes how Omron FINS works over UDP and TCP/IP.

Omron FINS over UDP

When communicating with Omron PLC Devices using UDP, the messages sent to the PLC will contain both Internet Address and FINS Address information:

Address FieldProtocolDescription
Target IP AddressIPThe target IP address in the IP header
Source IP AddressIPThe source IP address in the IP header
Target UDP PortUDPThe target port number in the UDP header
Source UDP PortUDPThe source port number in the UDP header
Destination FINS NetworkFINSThe destination FINS network number
Source FINS NetworkFINSThe source FINS network number
Destination FINS NodeFINSThe destination FINS node number
Source FINS NodeFINSThe source FINS node number

When a message is received by the Ethernet interface, these parameters are used to route the message to its destination:

  • Destination FINS Network,
  • Destination FINS Node.

The destination could be the local CPU unit or another PLC connected on a separate network.

When the destination replies, these parameters are used to route the message back to the Ethernet interface:

  • Source FINS Network,
  • Source FINS Node.

This diagram shows the message flow:

The important points to understand are:

  • The IP Address and Port number are not forwarded as part of the internal communications.
  • The reply arrives back at the Ethernet interface without this information.
  • The Ethernet interface needs a way of translating the destination FINS Node address back to an IP Address and UDP Port Number.

Omron Ethernet Interfaces provide up to four methods to map the destination FINS node address to the correct IP Address and UDP Port number:

ConversionRemote IP AddressRemote UDP Port Number
Automatic (dynamic)The IP Address from the inbound message is automatically added to a table mapping FINS node number to IP Address.The UDP Port Number from the inbound message is automatically added to a table mapping FINS node number to UDP Port Number.
Automatic (static)The network portion of the IP Address of the Ethernet interface combined with the FINS node number.Same as the FINS/UDP Port of the Ethernet interface. The default port number is 9600.
IP Address TableA manually configured table mapping FINS node number to IP Address.Same as the FINS/UDP Port of the Ethernet interface. The default port number is 9600.
Combined The IP Address Table lookup is attempted first. If the IP Address Table lookup fails, the Automatic method is tried.

Automatic (Dynamic) Conversion

In Automatic (Dynamic) Conversion:

Drivers omron modems compatible

Drivers Omron Modems Router

  • The Ethernet Interface listens to inbound messages.
  • The messages are used to populate a table mapping FINS node number to destination IP Address and Port number.

This is the easiest conversion method to use, but does mean the PLC will accept communications from any external source.

This mode is not supported on the older Ethernet Interface modules: CJ1W-ETN11, CS1W-ETN11 and CS1W-ETN01.

Automatic (Static) Conversion

Automatic (Static) conversion sets part of the IP Address of the Ethernet module using this operation:

(EthernetUnit IP AND NetworkMask) OR DestinationFINSNodeNumber

Examples of automatic Omron FINS Node Number to IP Address translation:

Ethernet Unit
IP Address		IP Network MaskDestination
FINS Node Number		Destination
IP Address
192.168.1.54255.255.255.05192.168.1.5
10.0.0.54255.0.0.010010.0.0.100
10.5.0.54255.0.0.025410.0.0.254

Note: If the IP Network Mask is more than 8 bits for the node number, some of the destination IP Addresses will be inaccessible. For example, if the IP Network Mask is 255.0.0.0, IP Addresses where either of the two middle numbers are non-zero would not be accessible.

IP Address Table Translation

In IP Address Table mode, the destination IP address is looked up from an address table configured in the Ethernet module. For example:

FINS NodeIP Address
20192.168.1.5
2510.1.0.240

Messages for FINS node 20 would be sent to 192.168.1.5, and messages for FINS node 25 would be sent to 10.1.0.240.

Combined Translation

In Combined Translation mode, the destination FINS node number is first looked up in the IP Address Table. If the lookup does not find an IP Address, the Automatic method is used.

Omron FINS over TCP/IP

Omron FINS over TCP/IP uses a lookup table to translate between the FINS Network and Node addresses and the corresponding TCP/IP connection.

The lookup table is a fixed size, which limits the number of connections allowed to the PLC. For example:

  • The CJ1W-ETN21 Ethernet module has a lookup table of 16 entries supporting 16 simultaneous connections.
  • The CP1W-CIF41 option module has a lookup table of 2 entries, supporting 2 simultaneous connections.

After establishing a TCP/IP link to the PLC, the client program will typically exchange FINS node addresses with the PLC. This sets up the entry in the lookup table for the TCP/IP link. Once the connection is set up the client program can exchange FINS messages with the PLC.

Further Information

For information about configuring CS/CJ PLC Devices with Ethernet communications.

Drivers Omron Modems Reviews

For information about the Omron Driver.

For the meaning of terms used in Fernhill SCADA.

Fernhill SCADA Version 3.66. Copyright © 2012-2021 Fernhill Software Ltd: All rights reserved.

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