User manual

Publication ENET-UM001I-EN-P - January 2010 219
EtherNet/IP Network Overview Appendix D
(COS) or at a requested packet interval (RPI). The frequency of update
depends upon the options chosen during configuration and where on the
network the input module resides. The input module, therefore, is a producer
of input data and the controller is a consumer of the data.
The controller can also produce data for other controllers to consume. The
produc
ed and consumed data is accessible by multiple controllers over the
Logix backplane and over the EtherNet/IP network. This data exchange
conforms to the producer/consumer model.
Configuration
Requirements
Before you can use an EtherNet/IP module, you must configure its IP
address, gateway address, and subnet mask.
IP Address
The IP address identifies each node on the IP network or system of connected
networks. Each TCP/IP node on a network must have a unique IP address.
The IP address is 32 bits long and has a network ID part and a host ID part.
Because n
etworks vary in size, there are four types of networks.
The network class determines how an IP
address is formatted.
IMPORTANT
Contact your network administrator or the Network Information
Center for a unique fixed IP address to assign to the EtherNet/IP
module.
EtherNet/IP Network Types
Network Type For
Class A Large networks with many devices
Class B Medium-sized networks
Class C Small networks (fewer than 256 devices)
Class D Multicast addresses
Class A
Class B
Class C
network (7 bits)
network (14 bits)
network (21 bits)
local address (8 bits)
local address (16 bits)
local address (24 bits)
0
0
0
0
0
0
1
1
1
8
8
8
16
16
16
24
24
24
31
31
31
Class D
multicast address (28 bits)
0
0 1
1
1
31
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