ProSoft Technology MVI56E-GSC - Using the Sample Add-On Instruction; Input;Output (I;O) Configuration and Module Properties

Reference MVI56E-GSC/GSCXT ♦ CompactLogix or MicroLogix Platform
User Manual Enhanced Generic ASCII Serial Communication Module
Page 92 of 140 ProSoft Technology, Inc.
April 24, 2017
4.5 Using the Sample Add-On Instruction
Ladder logic is required to use the MVI56E-GSC module. Tasks that must be
handled by the ladder logic are:
 Module backplane data transfer
 Application serial port data handling
 Special block handling
 Status data handling
 Power-up Handler (may be needed to initialize the module’s database and to
clear any processor fault conditions.)
The sample Import Rung with Add-On Instruction is extensively commented to
provide information on the purpose and function of each user-defined data type
and controller tag. For most applications, the Add-On Instruction will work without
modification for all of the tasks listed above, except any application-specific
parsing or compiling that may be needed to control input or output data and any
process-specific decision-making logic that may be needed based on input data.
In other words, the sample AOI will give you all the logic any application will need
to receive data on the module's ports, send data on the module's ports, manage
input and output image data transfers between the module and the processor,
and handle status data sent by the module to the processor. The only logic you
may need to add would be whatever you need to make use of incoming data
strings and whatever you need to create any outgoing data strings.
The sample logic consists of the following:
 I/O Configuration and Module Properties
 User-Defined Data Types
 Controller Tags
 Add-On Defined Data Types
 Add-On Instruction Logic
Each of these items will be covered in detail in the following sections.
4.5.1 Input/Output (I/O) Configuration and Module Properties
The I/O configurations and module properties control backplane data transfers
between the module and the ControlLogix processor. All of the parameters and
settings required have been discussed in an earlier section of the first chapter.
For additional details, please refer to Chapter 1, Creating the Module (page 36).