The GSV (get system value) instruction in RSLogix 5000 can retrieve the status of the communication or I/O modules.
The required parameters for GSV are:
If the module status code is non - 0, then the module is not present or is in error.
MVI56, MVI56E, fault
Article ID: 193
Created On: Tue, Nov 28, 2006 at 3:02 PM
Last Updated On: Tue, Jul 1, 2014 at 7:31 PM
Authored by: Technical Support
Online URL: https://www.prosoft-technology.com/kb/article.php?id=193