ProSoft Technology MVI56E-GSC/ GSCXT - Manual (Page 109)

MVI56E-GSC ♦ CompactLogix or MicroLogix Platform Reference
Enhanced Generic ASCII Serial Communication Module User Manual
ProSoft Technology, Inc. Page 109 of 140
May 9, 2014
As part of any restart operation, the module will send an input image block with
special block code of -1 to request the logic to send the configuration values held
in the GSC.CONFIG tag arrays. The logic will then form a special output image
block that sends the configuration data to the module. Once the module receives
and implements the configuration, it will set the GSC.CONTROL.ConfigDone bit
to a value of 1. At this point, if the Error/Configuration Word (page 131) shows no
errors (it shows a value of zero), the module has been successfully configured
and is read for normal operation.
GSC.UTIL Array
This tag array holds the tags needed for sample ladder logic sequencing and
control. You can think of these tags mostly as 'scratchpad' memory for the
sample logic to keep track of where it is in the processing cycle. These tags also
help control receiving strings longer than 200 characters.
The ladder logic will change and update these tags as it works its way through
the ladder process. Your application specific process and control logic can
monitor the status or values in these tags as part of you control application; but
should never write values to these tags, as this could cause serious adverse
effects on the module's data processing activity. Incoming data might be lost or
data that should be sent might not be transmitted.