Allen-Bradley controllogix 1756-L63, User Manual

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Publication 1756-UM001E-EN-P - August 2002
3-12 Communicate with 1756 I/O over an EtherNet/IP Network
Create Aliases
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.
A. From the Logic menu, select Edit Tags .
EXAMPLE
Create aliases
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.
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.
motor
<conveyor:0:O.Data.0>
motor
<conveyor:0:O.Data.0>
start
<Local:2:I.Data.1>
stop
<Local:2:I.Data.0>
42435
B.
C.
42421