Mitsubishi Electric MELSEC iQ-R-R00CPU User Manual page 419

• 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.
26.7 Determination of Control System/Standby System
26 BASIC CONCEPT
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