MVI56E-GSC/GSCXT ♦ CompactLogix or MicroLogix Platform Reference
Enhanced Generic ASCII Serial Communication Module User Manual
ProSoft Technology, Inc. Page 77 of 140
April 24, 2017
MVI56E-GSC Module
As shown in the illustration above, all data transferred between the module and
the processor over the backplane is through the input and output images. Ladder
logic must be written in the ControlLogix processor to interface the input and
output image data with data defined in the Controller Tags. Your ladder logic
must handle and interpret all data received on the application ports and
transferred into the input image. You must also construct messages to be
transferred out of the application ports by building the messages in the
appropriate controller tags for transfer to the output image of the module.
4.2.2 Data Flow between MVI56E-GSC Module and ControlLogix
Processor
The following topics describe the flow of data between the two pieces of
hardware (ControlLogix processor and MVI56E-GSC module) and other devices
attached to the application ports. Each application port on the module is
configured independently to interface with serial communication devices. The
sections below show the three possible types of communication devices that can
be attached to the application ports: write-only, read-only and read-write.
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