Omron NJ Series User Manual page 144

4 Determining IP Addresses
IP addresses that use classes are separated into blocks according to network IDs and host IDs, result-
ing in inefficient usage of IP address space.
CIDR does not use classes, so IP address space can be divided as required to more efficiently use IP
address space.
For example, using a subnet mask setting with CIDR enables building a horizontally distributed net-
work exceeding 254 nodes even if a class C address block (e.g., 192, 168...) is used.
Subnet Mask Range
192.0.0.0 to 255.255.255.252
4-4
NJ/NX-series CPU Unit Built-in EtherNet/IP Port User's Manual (W506)