Rockwell Automation DeviceLogix System User Manual - Manual (Page 69)

Publication RA-UM003B-EN-P - February 2010 69
Bind Function Blocks with I/O Chapter 3
Outputs
DeviceLogix device outputs (either Boolean or Analog) can connect to
the output of any function blocks or can be driven directly by an
input. There are two types of outputs described below.
Connect I/O points and
function block instructions Once you have I/O points and function blocks represented in your
workspace, you want to connect them to actually create the flow of
the logic. You can:
• bind the function block’s input to input components
• bind the input component directly to output component
• bind the function block’s output to function block’s input
Connection rules
When making connections, keep the following rules in mind:
• You can attach a function block output pin to any function block
input pin. This gives you feedback capability.
• You can tie a hardware input or any other input pin directly to a
hardware or network output pin.
• You cannot tie hardware or network output connection pin to a
function block input pin.
• You cannot attach a function block output pin to any input pin.
Output Category Description
Hardware Hardware outputs 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 (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 Network outputs report the results of the local logic to a master.
These outputs can be attached to any output point on any
function block, and are part of the produced data from the device.
They can also be connected to status, faults, or inputs.