ProSoft Technology ILX34-AENWG - Manual (Page 155)

ILX34-AENWG ♦ Point I/O Platform Reference
Wireless POINT I/O Adapter User Manual
ProSoft Technology, Inc. Page 155 of 177
August 16, 2013
 Control of real-time I/O data (also known as implicit messaging) - the ILX34-
AENWG adapter serves as a bridge between POINT I/O modules and the
network
 Support of messaging data for configuration and programming information
(also known as explicit messaging)
6.2.2 Understand the Producer/Consumer Model
The CIP producer/consumer networking model replaces the old
source/destination (master/slave) model. The producer/consumer model reduces
network traffic and increases speed of transmission. In traditional I/O systems,
controllers poll input modules to obtain their input status. In the CIP system, input
modules are not polled by a controller. Instead, they produce (multicast) their
data either upon a change of state (COS) or periodically.
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
produced and consumed data is accessible by multiple controllers and other
devices over the EtherNet/IP network. This data exchange conforms to the
producer/consumer model.
6.2.3 Use of the Common Industrial Protocol (CIP)
The ILX34-AENWG adapter uses the Common Industrial Protocol (CIP). CIP is
the application layer protocol specified for EtherNet/IP, the Ethernet Industrial
Protocol, as well as for ControlNet and DeviceNet networks. It is a message-
based protocol that implements a relative path to send a message from the
producing device in a system to the consuming devices.
 The producing device contains the path information that steers the message
along the proper route to reach its consumers. Since the producing device
holds this information, other devices along the path simply pass this
information; they do not need to store it.
This has the following significant benefits.