Patrick Yong · Commissioning
1518H, two IM, one Comfort panel. FAT switchover was pretty. On the floor the HMI blinks and a SINAMICS telegram 1 drop takes a second longer than we sold. What do you test that isn't 'pull the power on CPU A'?
Siemens / TIA
First S7-1500H redundant pair — what bit you on switchover that the brochure skipped?
Marcus Hale · Controls engineer · body shop
Test HMI connections, drive telegrams, and any open TCP. Pull the PROFINET cable on the primary, not only the 24 V. Watch the AR and the panel's connection resource. A pretty CPU switchover with a dead telegram is still a crash. Time it with a scope on a physical output, not the diagnostic buffer.
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