Rockwell Automation 1756-LSC8XIB8I ControlLogix Low-speed Counter Module User Manual
Page 45
Rockwell Automation Publication 1756-UM536A-EN-P - April 2012
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Configure the Module
Chapter 4
You must run RSNetWorx software to enable modules in a remote ControlNet
chassis. Running RSNetWorx software transfers configuration data to remote
modules 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.
If you are not using the modules in a remote ControlNet chassis, running
RSNetWorx software is not necessary. However, anytime a controller references a
module in a remote chassis, RSNetWorx software must be run to configure the
ControlNet network.
In an ControlNet network, scheduled data is sent at the RPI regardless of any
COS activity occurring on the backplane of the remote chassis.
In an EtherNet/IP network with a multicast connection, data may be sent over
the network as fast as one quarter of the RPI. For example, if an I/O module is
sending data every 10 ms and the RPI is set at 100 ms, the data transfer rate over
the EtherNet/IP network will be every 30 ms.
IMPORTANT
Do not use unscheduled communication to the counter module in a remote
chassis over a ControlNet network.
IMPORTANT
In a peer control operation where the counter module provides peer input data
directly to a 1756-OB16IEF module, both the counter module and
1756-OB16IEF module can reside in a remote chassis as long as they are both
located in the same physical chassis. For more information about peer control,
refer to the Peer I/O Control Application Technique, publicatio