MVI56E-GSC/GSCXT ♦ CompactLogix or MicroLogix Platform Reference
Enhanced Generic ASCII Serial Communication Module User Manual
ProSoft Technology, Inc. Page 93 of 140
April 24, 2017
4.5.2 User-Defined Data Types
When you import the rung with the Add-On Instruction (AOI), several new User-
defined Data Types (UDTs) are created for you. These UDTs form the basis for
creating many of the Controller Tags and Tag Arrays used in the sample AOI
logic.
GSCBLOCKSTATUS
This low-level data type creates tags to hold module status values that show
input and output image (I/O) block transfer activity. These block transfers occur
between the module and the ControlLogix processor. This low-level structure is
used to create the higher-level structure, GSCSTATUS.
These tags hold values of module internal counters that keep a running total of
how many input and output image blocks have been transferred between the
module and the ControlLogix processor. During normal operation, the values
displayed for Read, Write, and Parse should increment together and be very
close to the same values, unless backplane errors are occurring. If backplane
errors are occurring, the Err value will increment and the Parse value will not.
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