Create Aliases - Allen-Bradley ControlLogix System 1756-L1 User Manual

3-12 Communicate with 1756 I/O over an EtherNet/IP Network

Create Aliases

Create aliases
EXAMPLE
The following logic was initially programmed using descriptive tag names, such as start
and motor. Later, the tags were converted to aliases for the corresponding I/O devices.
start is an alias for the push button that is wired to point 1 of the
module that is in slot 2 of the local chassis. When the push button
is on, start is on.
stop
<Local:2:I.Data.0>
B.
Publication 1756-UM001E-EN-P - August 2002
In this task, you convert tags in your programs to aliases for I/O
points or channels (devices). As an alias for an I/O point or channel,
each tag:
• provides a descriptive name for the device that is wired to the
point or channel
• represents the value of the point or channel. When one changes,
the other reflects the change.
start
<Local:2:I.Data.1>
motor
<conveyor:0:O.Data.0>
A. From the Logic menu, select Edit Tags.
motor is an alias for the starter contactor that is wired to point 0 of
the module that is in slot 0 of a remote chassis (named conveyor).
When motor turns on, the starter contactor turns on.
C.
motor
<conveyor:0:O.Data.0>
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