Rockwell Automation GMLC Reference Manual - Manual (Page 373)

Publication GMLC-5.2 - November 1999
336 Program Control Blocks
Unlike an End Program block with End selected elsewhere in the diagram
(which executes the When End or Fault type block), an End Program
block with End selected in the fault handler itself unconditionally stops all
tasks and ends the program. Thus, it is imperative that you use an explicit
End Program block with End selected in the fault handler—rather than
just connecting the bottom (false) node of the last If Expression block to
the block of the module—if neither a global or runtime fault is
active.
!
ATTENTION: An End Program block, with End
selected, in the fault handler unconditionally ends the
program.