I/O modules in the local chassis, and modules in a remote chassis connected via the EtherNet/IP network,
or unscheduled connections on the ControlNet network, are ready to run as soon as the configuration data has been downloaded.
However, to enable scheduled connections to I/O modules on the ControlNet network,
you must schedule the network by using RSNetWorx for ControlNet software.
Running RSNetWorx™ software transfers configuration data to I/O modules on a
scheduled ControlNet network and establishes a network update time (NUT) for the
ControlNet network that is compliant with the desired communication options specified for each module during configuration.
1756 ControlLogix-XT Controllers
The ControlLogix-XT™ controllers function in the same way as the traditional ControlLogix controllers.
The ControlLogix-XT products include control and communication system components that are conformally coated
for extended protection in harsh, corrosive environments:
• When used with FLEX I/O-XT™ products, the ControlLogix-XT system can withstand temperature ranges of -20…+70 °C (-4…+158 °F).
• When used independently, the ControlLogix-XT system can withstand temperature ranges of -25…+70 °C (-13…+158 °F).
• Customers who previously used the LXT chassis should now migrate to the K version of the chassis.

1756 ControlLogix Controllers
The ControlLogix® controller provides a scalable controller solution that is capable of addressing many I/O points. You
can place the ControlLogix controller into any slot of a ControlLogix I/O chassis, and install multiple controllers in the
same chassis.
ControlLogix controllers can monitor and control I/O across the ControlLogix backplane, and over network links. The
ControlLogix 5580 controllers have an embedded Ethernet port for a direct connection to Ethernet-enabled devices and
networks, and also support communication interface modules in the local chassis. To provide communication for
ControlLogix 5570 or ControlLogix 5560 controllers, install the appropriate communication interface module into the
local chassis.
ControlLogix 5580 and ControlLogix 5570 controllers are available with a conformal coating. A conformal coating
provides a layer of protection against contaminants and humidity to help protect the assembly and extend product life in
harsh, corrosive environments. Products with a conformal coating have a ‘K’ suffix at the end of the catalog number.
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