The First Scan Bit in Studio 5000: What S:FS Is For, and What It Must Never Do

Three stages across one transition to Run mode: prescan with outputs cleared, timers reset and inputs not current; the first normal scan with S:FS true for that one scan; and every later scan with S:FS false, annotated with what each stage resets

The bagger came back with 0.0 in every recipe setpoint at 06:10, with nobody at the HMI and no download on the log. The only change on that shift was a program that had been inhibited while somebody edited it and then put back in, and the initialisation rung inside it — one XIC on … Read more

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