Chapter 15: Appendix

[3] Physical implementations of an FL-net

There are five physical implementations of an Ethernet network that support a 10M bps data transfer speed. They are 10BASE5, 10BASE2, 10BASE-T, 10BASE-F, and 10BROAD36 (this is not common/). In addition to these implementations, a 100M bps Ethernet transmission speed is also available.

The FL-net supports 10BASE5 (recommended), 10BASE2, and 10BASE-T hardware.

[4] IP addresses on the FL-net

In order to identify one communication device among lots of devices connected to an Ethernet network, the FL-net uses IP addresses (INET address). Therefore, each device that is connected to the network mist have its own IP address.

An IP address consists of one part that identifies the network to which the device is connected, and a unique device address. Depending on the size of the network, a network can be classified as one of three classes: A, B, and C. (For special use, class D and E are also available.)

Classes of IP address

 

Top octet value

Network address section

Device address section

Class A

0 to 127

 

 

xxx.xxx.xxx.xxx

Xxx.xxx.xxx.xxx

 

 

 

 

 

 

 

 

 

 

Class B

128 to 191

 

xxx.xxx.xxx.xxx

Xxx.xxx.xxx.xxx

 

 

 

 

 

 

 

 

 

Class C

192 to 223

 

xxx.xxx.xxx.xxx

Xxx.xxx.xxx.xxx

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(Note: The gray digits are respective addresses.)

In a network, the IP address of all the communicating devices connected to this network will have the same network address. They should each have a unique device address.

The default value for the FL-net IP address is "192.168.250.N" (N is the node number: 1 to 254). The FL-net standard recommends using a class C IP address and the lower three digits of the address can be used to assign node numbers according to the FL-net protocol.

Network address

Device address

Fixed

FL-net IP address

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