Omron CS1W-ETN21 Subnet Mask, Broadcast Settings, Class Subnet mask, Setting Contents

Basic Settings Section 2-9

Example: Using the CX-Programmer to Set the IP Address to 10.3.65.1

When an IP address is set in the Unit Setup, that value is displayed in the IP

Address Display/Setting Area in the DM Area words allocated for CPU Bus

Units.

When the IP address is set by the CX-Programmer, and the defaults are used for all other Unit settings, the settings will be as shown below.

Item	Status
IP address	Set by CX-Programmer.
Subnet mask	Uses value corresponding to IP address class.
Broadcast settings	4.3BSD specifications
Baud rate	Auto
TCP/IP keep-alive	120 minutes
IP router table	Not set. (IP routing not supported.)

■Subnet Mask

For the subnet mask, all bits corresponding to the bits in the IP address used as either the net number or the subnet number are set to 1, and the bits corre- sponding to the host number are set to 0. These settings must be made when using an address conversion method other than the IP address table method.

If no subnet mask is set, or if an illegal value is set, the following values will be used depending on the IP address class.

Class	Subnet mask
Class A	255.0.0.0
Class B	255.255.0.0
Class C	255.255.255.0

With the default setting (0.0.0.0), a subnet mask corresponding to the IP address class is used.

■Broadcast Settings

Set the method for specifying IP addresses when broadcasting.

Setting	Contents
All 1 (4.3BSD)	Broadcast with all ones for Host ID (4.3BSD specifications).
(Default)
All 0 (4.2BSD)	Broadcast with Host ID all zeros (4.2BSD specifications).

48