3-8 Creating Routing Tables
Contents
1. 3 10 Creating an IP Address Table Connecting and Using a Programming Device for the PC An IP address table is a table of correspondences between node numbers and IP addresses and it is used for finding IP addresses from FINS node numbers It is necessary to register an IP address table when using the IP address table method as the method for address conversion For details regarding prelimi nary procedures refer t31 Before Operation An IP address table does not necessarily need to be registered in order to use the combined method for address conversion If none is registered however the automatic address generation method will always be used If the automatic address generation method is to be used exclusively then there is no need to register an IP address table In that case proceed to 3 11 Creating an IP Router Table The IP address table must be created by a CX Programmer connected to the PC It cannot be created using a Programming Console For details on how to connect and use a CX Programmer refer to the CX Programmer User s Manual 3 11 Creating an IP Router Table Connecting and Using a Programming Device for the PC Note An IP router table is a table of correspondences between IP router IP addresses and the network numbers of segments relayed by the IP router If the Ethernet network is configured of multiple segments an IP router table must be registered for communications between the segments For det2. 07 Local network Unit number address 1 04 2 05 3 06 4 07 Network 1 Network 2 Network 3 Network 4 Note 1 The unit number is set from 0 to F 1 to 15 by the rotary switch on the front of the Ethernet Unit 2 The network address is the number of the network from 1 to 127 to which the Communications Unit or Board is connected It is set when the local net work table is created Relay Network Table A relay table is a table that shows the nodes to which data should be sent first in order to send data to a network that is not connected to the local node It shows the correspondence between the address of the final destination network and the network address and node number of the first relay point of the path to reach there When internetwork communications are carried out the end network can be reached by following the relay points The following example shows a routing table for sending data from PC 1 the local node network address 1 node number 1 to PC 4 the destination node network address 3 node number 2 pca Node 2 relay node ieat in PC 4 destination node PC 1 local node PC 2 relay node 4 Unit 1 Node 2 Network 1 R l PC 1 PC 2 PC 3 End network relay network table relay network table relay network table Local network Unit address number ae To go to network 3 3 j first go to node 2 at network 2 To go to network 3 To go to network 3 The
3. network is the same first go to node 3 at according to the local 0 90 to node 2 at network 3 network 1 network table go through the unit number of the local CPU Rack 34 Creating Routing Tables Section 3 8 3 8 2 Connecting and Using a Peripheral Device for the PC Routing tables must be created by a CX Programmer connected to the PC They cannot be created using a Programming Console For details on how to connect and use a CX Programmer refer to the CX Programmer User s Manual Note 1 To transfer routing tables for multiple nodes to a PC in one batch connect the CX Programmer to a PC with only one Communications Unit mounted Routing tables cannot be transferred to other nodes from a PC with multiple Communications Units mounted 2 Routing tables can only be transferred as a batch to multiple nodes within the same network as the PC to which the CX Programmer is connected Routing Table Setting Examples Example 1 Local Network Table for a PC With Multiple Units Mounted This example shows the local network table settings for a PC to which multiple CPU Bus Units are mounted Ethernet network Controller Link network Network A Network B Elciclp PS Power Supply Unit TILI PIS CPU CPU Unit r u ETN Ethernet Unit Unit a Unit b CLK Controller Link Unit Local Network Table Local CPU Bus network ni 1 2 35 Creating Routing Tables Section 3 8 Example 2 Three Interc
4. Creating Routing Tables Section 3 8 Use the following procedure to create the I O table Initial screen Save or clear the CPU Bus Unit System Setup 3 8 Creating Routing Tables When the FINS communications service is used routing tables must be created in advance Routing tables are required in the following circumstances e When the FINS communications service is used on an Ethernet network in cluding when communications are only carried out between FA networks via an Ethernet network e When there are multiple Communications Units mounted to the PC and sock et services are requested by executing the CMND 490 instruction If neither of these circumstances apply then a routing table is not required In that case proceed ty 9 9 System Setup The routing table is required not only for nodes communicating via the FINS communications service but for all relay nodes on the network 3 8 1 Routing Table Overview The routing tables describe the transmission path for FINS messages when the FINS communications are used It consists of two tables A local network table and a relay network table 33 Creating Routing Tables Section 3 8 Local Network Table The local network table is a table describing the correspondences among unit numbers of the Communications Units and Boards mounted to each node PC or FA Computer Unit 04 Unit 05 Unit 06 Local Network Table Example Unit
5. ails on segments and con necting nodes refer tq4 2 2 Node Connections If the Ethernet network has the minimal configuration of just one segment there is no need to create an IP router table In that case proceed to 3 12 Checking Communications An IP router table needs to be created only when the IP address table method or the combined method is used for address conversion The IP router table must be created by a CX Programmer connected to the PC It cannot be created using a Programming Console For details on how to connect and use a CX Programmer refer to the CX Programmer User s Manual 3 12 Checking Communications The Ethernet Unit supports the PING command which is also widely supported by host computers It also supports a function for internode testing in the FINS communications service by simply manipulating bits with a Programming De vice After the settings and connections have been completed use either the PING command or the internode test function as required to check communications with the remote nodes 39 Section 3 12 Checking Communications 3 12 1 PING Command and Internode Testing The following table outlines the points of difference between the PING command and internode testing Main application PING command Testing communications as an Ethernet node Internode testing Checking settings such as FINS addresses for using the FINS communications service Test objects E
6. ay sail network node Relay network table End Relay Relay network network node Relay network table End Relay Relay network network node Relay ale network node 37 System Setup Section 3 9 3 9 System Setup The settings for the Ethernet Unit s basic and special functions are made in the CPU Bus Unit System Setup These settings and the situations in which the set tings must be made are shown in the following table For details on how to make the settings refer tq4 2 CPU Bus Unit System Setup 3 9 1 When Settings are Required Settings When settings are required Broadcast setting When Ethernet is used with UNIX 4 2BSD specifications Address conversion method e When the FINS communications service is used on an Ethernet network e When it is necessary to set a value outside of the range of 1 to 126 for the least signifi cant byte of the local IP address UDP port number for FINS When it is necessary to set a value other than the default 9600 for the FINS UDP port number Subnet mask When it is necessary to set a subnet mask FTP login name FTP password When setting the login name and password at the FTP server IP address table e When the FINS communications service is used on an Ethernet network e When it is necessary to set a value outside of the range of 1 to 126 for the least signifi cant byte of the local IP address IP route
7. onnected Networks This example shows the relay network table settings for three different intercon nected networks Relay Network Table End Relay network ie Network A Network B Node Hd Network C In the table for PC 3 for example if network A is taken as the end network then network B becomes the relay network and node c becomes the relay node If network C is taken as the end network then network B still becomes the relay network and node e becomes the relay node 36 Creating Routing Tables Section 3 8 Example 3 All Nodes This example uses the following configuration to show the routing tables for all nodes Unit 3 Node 4 Unit 2 Network 20 PC 1 Routing Table Local network table Local CPU Bus network No PC 2 Routing Table Local network table PC 3 Routing Table Local network table PC 4 Routing Table Local network table PC 5 Routing Table Local network table Local CPU Bus ae a me PC 6 Routing Table Local network table Local CPU Bus uai a No PC 7 Routing Table Local network table ocal PU B neok Node 3 Network 10 Unit 4 Node 5 Unit 7 Node 15 Network 30 Unit 6 Node 10 Unit 1 Unit 5 Node 2 Node 5 Relay network table End oe Relay Relay network node 4 Relay network table Relay Relay network node Relay network table End Relay Rel
8. r table e When the Ethernet network is configured with multiple segments Mail function When the mail function is used Refer tq4 2 CPU Bus Unit System Setup for details 3 9 2 Using a Programming Device The settings for the CPU Bus Unit System Setup must be made by a CX Pro grammer connected to the PC The settings cannot be made using a Program ming Console For details on how to connect and use a CX Programmer refer to the CX Programmer User s Manual 3 9 3 CPU Bus Unit System Setup Defaults 38 The following table shows the items in the CPU Bus Unit System Setup and their default settings Item Default Broadcast settings All 1 4 3BSD specifications Address conversion method Automatic address generation UDP port number for FINS 9600 Subnet mask 0 0 0 0 A value corresponding to the IP address is used FTP login name CONFIDENTIAL FTP password Not set IP address table Not set IP router table Not set Mail settings None set User created mail data address Not set Local mail address Not set Destination mail address Not set SMTP server address 0 0 0 0 Not set For information on IP address table settings refer tq3 10 Creating an IP Ad dress Table For information on IP router table settings refer ty 3 11 Creating an IP Router Table For information on IP mail transmission settings refer to Sec tion Mail Checking Communications Section 3 12
9. rvice settings Using it between Communications Units and Boards that support it makes it possible to check whether the FINS communications service settings are correct For details on using the internode test refer tq 9 3 Internode Test 1 The internode test can be easily carried out by manipulating dedicated con trol switches for the Ethernet Unit For details refer tq 9 3 Internode Test 2 Internode testing of the FINS communications service can also be carried out by means of the FINS commands INTERNODE ECHO TEST and BROADCAST TEST RESULTS READ For details refer tg 41 3 4 INTER NODE ECHO TEST anq41 3 5 BROADCAST TEST RESULTS READ
10. thernet Units and Ethernet devices that support PING OMRON Units and Boards that support FINS communications service internode testing Network classification Within Ethernet networks including between segments Up to three levels of Ethernet networks and FA networks Address system used IP addresses FINS address system network and node numbers Note Requires routing tables Transmission from Ethernet Unit PING command is issued to Ethernet Unit by CMND 490 instruction in user program Set required parameters in DM from Programming Device and manipulate start switch bit Reception at Ethernet Unit 3 12 2 PING Command 3 12 3 Internode Test 40 Note When PING command is received it is automatically returned When internode test message is received it is automatically returned The PING command checks communications with another node by sending an echo back request packet and receiving a response packet Use the PING com mand as required to check communications Using the PING command between nodes that support the PING command makes it possible to check whether internode communications are normal For details on using the PING command refer tp9 2 PING Commana The internode test is a function for checking a network by sending data to and from specified nodes and checking the responses Use the internode test as re quired to check the FINS communications se
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