In LogixPro’s “Dual Compressor Exercise 2,” the goal was simple: maintain 90–100 PSI with two compressors, handle duty cycling, and prevent both from running simultaneously for too long to avoid overload. The twist? A random “fault” could disable one compressor, forcing the other to handle the load within strict time limits.

At 2:30, Maria Chen, the shift electrician, pulled up the LogixPro simulation on her laptop—the training software she’d mastered years ago. But this wasn’t a classroom exercise. This was Exercise 2 for real.

“You just passed Exercise 2 with a gold star,” said the plant manager, handing her a bottle of water.

She jumped to the control cabinet, fingers flying over the old Allen-Bradley pushbuttons. She disabled the automatic lead-lag and forced Atlas into continuous run. Then she saw the problem: Atlas’s unloader solenoid was sticky. The compressor was starting under full load, drawing 300% amperage. The thermal overload relay clicked once, twice—on the third click, it would trip.

Maria stared at the LogixPro window still open on her laptop. The virtual pressure gauge was steady at 95 PSI. The virtual “Dual Compressor Exercise 2” completion banner flashed green.

For six years, the system had run on a simple lead-lag routine: Titan ran all day, Atlas kicked in only when the pressure sagged below 95 PSI. It was dumb, but it worked. Until the heatwave.

In the LogixPro simulation, you had ladder logic timers: T4:0 for the “minimum run time” and T4:1 for the “anti-cycle delay.” Maria had no time to program. She had to become the PLC.

She smiled, exhausted. “Yeah,” she said. “But in the simulation, the compressors don’t smell like burnt oil and fear.”

The plant floor at Apex Bottling was a cathedral of stainless steel and hydraulic hiss, but its heart was pneumatic. Two massive air compressors, Titan and Atlas, squatted in the corner, responsible for breathing life into the filling heads, capping machines, and labeling jets. If the air pressure dropped below 90 PSI, the entire line screeched to a halt. If it dropped below 80 PSI, safety interlocks would fire, locking the plant down entirely.

When the maintenance crew finally replaced Titan’s fan at 4:00 PM, Maria collapsed into a rolling chair. On the HMI, the pressure trend showed a near-perfect line at 88 PSI, with only one brief dip to 81.5 PSI.

Atlas groaned, then spun. The unloader, freed by the pressure relief, clicked open. The compressor started unloaded. Pressure had fallen to 82 PSI—two pounds above disaster.

Julie

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Logixpro Dual Compressor Exercise 2 < 2026 >

“You just passed Exercise 2 with a gold star,” said the plant manager, handing her a bottle of water. logixpro dual compressor exercise 2

Maria stared at the LogixPro window still open on her laptop. The virtual pressure gauge was steady at 95 PSI. The virtual “Dual Compressor Exercise 2” completion banner flashed green. In LogixPro’s “Dual Compressor Exercise 2,” the goal

For six years, the system had run on a simple lead-lag routine: Titan ran all day, Atlas kicked in only when the pressure sagged below 95 PSI. It was dumb, but it worked. Until the heatwave.

In the LogixPro simulation, you had ladder logic timers: T4:0 for the “minimum run time” and T4:1 for the “anti-cycle delay.” Maria had no time to program. She had to become the PLC. At 2:30, Maria Chen, the shift electrician, pulled

She smiled, exhausted. “Yeah,” she said. “But in the simulation, the compressors don’t smell like burnt oil and fear.”

Atlas groaned, then spun. The unloader, freed by the pressure relief, clicked open. The compressor started unloaded. Pressure had fallen to 82 PSI—two pounds above disaster.