STEP 7 V5.5 SP2 or higher, or PCS 7 V8.0/V8.1/V8.2.
This appears to be related to software — likely an update or project-related executable for STEP 7 (possibly version V5.5 SP1 or SP13). simatics7fprojxv55sp13upd1exe exclusive
Marcus pulled up the substation’s telemetry—or what should have been telemetry. Instead, he found a heartbeat. 0.07 Hz. And a text file, logged into the system’s bare-metal memory at the exact moment the executable arrived. STEP 7 V5