Chapter
4
Creating Ladder Logic Programs
Chapter Objectives
Chapter 4 provides information about ladder logic programs for
products connected to a Remote I/O communications module. In this
chapter, you will read about the following:
• I/O image table.
• Control Features.
• Datalinks.
• Example ladder logic programs for PLC, SLC, and Logix5550
controllers.
Understanding the I/O Image
Table
The Remote I/O communications module allows a SCANport product
to look and act like a Remote I/O chassis when connected to a
programmable controller. Data contained in the input/output image
table is transferred between the programmable controller by the
Remote I/O scanner, the same as with any Remote I/O chassis. You
control the location of data transferred by setting the rack address and
starting group. You control the amount of data by setting the DIP
switches on SW3.
Important:
The communications module does not scale the data that
is transferred. Consequently, all scaling of the data must
be done in the controller. Refer to the user manual for your
SCANport product for details on device units.
Important:
The Remote I/O to SCANport conversion is asynchronous.
Data sent to the adapter for transfer to the drive must be
maintained until the drive has received data.
!
ATTENTION: When you configure a system for the first
time, you should disconnect the motor from the machine or
the process during the initial testing.
!
ATTENTION: The configurations and program examples
shown in this manual are intended solely for purposes of
example. Since there are many variables and requirements
associated with any particular installation, Rockwell Auto-
mation does not assume responsibility or liability (to in-
clude intellectual property liability) for actual use based
upon the examples shown in this publication.
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