26  BASIC CONCEPT
26.7  Determination of Control System/Standby System
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 • If both systems start up successfully, a stop error does not occur because an initial execution type program 
is not executed on the other system.
 • If a stop error has occurred in this program, the possible cause is a tracking cables failure. Check the 
connection of tracking cables and power off and on or reset the CPU module on the system in which the 
stop error has occurred.