Rockwell Automation DeviceLogix System User Manual - Manual (Page 12)

12 Publication RA-UM003B-EN-P - February 2010
Chapter 1 What is DeviceLogix Functionality?
Inputs and Outputs
Inputs and outputs can be one of two types.
• Physical - Inputs and outputs realized by physical connections to
the device. These are referred to as Discrete/Analog Inputs or
Discrete/Analog Outputs.
• Networked - Inputs consumed by the device from the network
and outputs produced by the device onto the network.
Input and Output Bits
There are five types of DeviceLogix inputs. Inputs are read from the
Electronic Data Sheet (EDS) file or are created dynamically during
logic configuration. The inputs that are read from the EDS file cannot
be modified. The DeviceLogix inputs are:
• Device Input - A physical input of the device. Device inputs
represent the actual inputs, such as sensors and switches,
attached to a particular device.
• Network Input - Formerly called the Consumed Network Bit
(CNB), network input is data sent from a master that can be
used in the device’s logic.
• Device Status - Status inputs indicate the state of the device. For
example, if an explicit message connection exists between the
device and a master, an input called ‘explicit connection exists’
is set to true and possibly affects the logic the device performs.
• Device Fault - Faults are conditions that report device errors. For
example, if a device detects a short circuit on an output, a fault
input is set to true and possibly affects the logic the device
performs.