Rockwell Automation DeviceLogix System User Manual - Manual (Page 13)

Publication RA-UM003B-EN-P - February 2010 13
What is DeviceLogix Functionality? Chapter 1
There are two types of DeviceLogix outputs:
• Device Output - Hardware outputs that are the actual outputs,
such as lights and actuators, attached to a particular device.
Without DeviceLogix functionality, the master would normally
control the outputs via consumed data. In fact, if there is no
local logic controlling an output, the master controls the output
as it would if DeviceLogix functionality were not running on the
device. However, within DeviceLogix functionality, if the local
logic controls an output, the master no longer controls the
output. The only way the master can affect the state of an output
that is under local control is to route requests to the local logic
by using network inputs. Some outputs can be under local
control while others can still be controlled by the master.
• Network Output - Formerly called Produced Network Bit (PNB),
Network outputs report the results of the local logic to a master
and are part of the produced data from the device.
Local Function Block Logic
The local logic of a DeviceLogix device consists of function blocks,
inputs, outputs, and connections (wires) between them. Function
blocks contain connection points (called pins) and perform a specific
function. Inputs and outputs also have connection pins and represent
the actual hardware devices, networked data, and fault and status bits
that are available for use in the local logic.
A connection (wire) between function blocks is defined when an
input pin of one function block is bound to an output pin of another
function block. A pin can be bound to a:
• pin of another function block.
• physical input/output.
• networked input/output.
• fault or status bit.
• miscellaneous bit.
• block input enable bit and block output enable bit.
Function blocks may also have attributes that influence their function.
Configuring a DeviceLogix device consists of defining or editing the
local logic that is present on the device along with the EDS parameters
for that device.