Owner’s Guide 0300199-01 Rev. D
Chapter 3
Operation Within the
ControlLogix System
This chapter describes how the 1756sc-CTR8 analog module works within the
ControlLogix system. This chapter covers:
• Ownership and connections to the module.
• Direct connections.
• Listen only mode.
• Configuration changes with multiple owners.
Every I/O module in the ControlLogix system must be owned by a Logix5550
Controller to be useful. This owner-controller stores configuration data for every
module that it owns and can be local or remote in regard to the I/O module’s
position. The owner sends the I/O module configuration data to define the
modules’ behavior and begin operation within the control system. Each
ControlLogix I/O module must continuously maintain communication with its
owner to operate normally.
Typically, each module in the system will have only 1 owner. Input modules can
have more than 1 owner. Output modules, however, are limited to a single owner.
The I/O configuration portion of RSLogix5000 generates the configuration data
for each I/O module in the control system, whether the module is located in a
local or remote chassis. A remote chassis, (networked), contains the I/O module
but not the module’s owner-controller. Configuration data is transferred to the
controller during the program download and subsequently transferred to the
appropriate I/O modules. I/O modules in the same chassis as the controller are
ready to run as soon as the configuration data has been downloaded. You must
run RSNetWorx to enable I/O modules in the networked chassis.
Running RSNetWorx transfers configuration data to networked modules and
establishes a Network Update Time (NUT) for ControlNet that is compliant with
the desired communications options specified for each module during
configuration. If you are not using I/O modules in a networked chassis, running
RSNetWorx is not necessary. However, anytime a controller references an I/O
module in a networked chassis, RSNetWorx must be run to configure
ControlNet.
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