Bradley Smoker 1734-AENT Manual De Usuario
Publication 1734-UM011C-EN-P - January 2006
About the Adapter 1-7
Support of Rack-optimized
and Direct Connections
and Direct Connections
The 1734-AENT adapter supports both direct and rack-optimized
connections. A direct connection is a real-time data transfer link
between the controller and whatever module occupies the slot that
the configuration data references. Direct connection messaging occurs
at a cyclic rate specified by the RPI during configuration. A
rack-optimized connection is a grouping of data from more than one
I/O module into a single block of data sent over a single connection
at the same data rate.
connections. A direct connection is a real-time data transfer link
between the controller and whatever module occupies the slot that
the configuration data references. Direct connection messaging occurs
at a cyclic rate specified by the RPI during configuration. A
rack-optimized connection is a grouping of data from more than one
I/O module into a single block of data sent over a single connection
at the same data rate.
Rack-optimized connections reduce the total number of connections
needed to transfer data when using many I/O modules in a system.
The following example illustrates the benefit of rack-optimized
connections.
needed to transfer data when using many I/O modules in a system.
The following example illustrates the benefit of rack-optimized
connections.
Assume you set up a system that contains 8 digital I/O modules
interfaced to a 1734-AENT adapter. If you use direct connections to
transfer data to each of the these I/O modules, you need 8
connections to transfer all of the data, one to each of the 8 I/O
modules. If you use a rack-optimized connection to transfer the data,
you only need a single connection – the connection to the 1734-AENT
adapter.
interfaced to a 1734-AENT adapter. If you use direct connections to
transfer data to each of the these I/O modules, you need 8
connections to transfer all of the data, one to each of the 8 I/O
modules. If you use a rack-optimized connection to transfer the data,
you only need a single connection – the connection to the 1734-AENT
adapter.
See the EtherNet/IP Performance and Application Guide, publication
number ENET-AP001, for more information on connections.
number ENET-AP001, for more information on connections.
Mix Rack-optimized and Direct Connections
You can mix communication formats for different I/O modules
communicating through the same adapter. I/O modules set up to use
rack optimization communicate at the rate of the RPI configured for
the 1734-AENT adapter. I/O modules configured for direct
communication communicate at their own set RPIs and ignore the
1734-AENT adapter’s RPI.
communicating through the same adapter. I/O modules set up to use
rack optimization communicate at the rate of the RPI configured for
the 1734-AENT adapter. I/O modules configured for direct
communication communicate at their own set RPIs and ignore the
1734-AENT adapter’s RPI.
IMPORTANT
Although rack-optimized connections offer an
efficient way to use resources, there are a few
limitations on their use:
efficient way to use resources, there are a few
limitations on their use:
• You can use only rack-optimized connections
to send data to and from digital I/O modules.
Analog or speciality I/O requires direct
connections.
Analog or speciality I/O requires direct
connections.
• All data is sent at the same time as the RPI rate
of the 1734-AENT adapter.