“Master Arjun,” called out a fresh-faced apprentice named Boom, “Line 4 is down. The mold won’t clamp.”

“But the alarm is here,” Arjun murmured. He stopped on Rung 214. It was a simple seal-in circuit. A start button (X1.0) that latched a motor contactor (M10). But the contactor’s auxiliary contact (M10a) wasn’t sealing.

He walked to the dusty cabinet, the one with the “DANGER: HIGH VOLTAGE” sticker faded to a whisper. He pulled out a battered FANUC programming pendant, the monochrome screen flickering to life. The keys were membrane, worn smooth by decades of thumb presses.

Arjun didn’t look up from his coffee. “What’s the alarm?”

“The weld has cracked,” Arjun said. “The relay feels closed, but the ladder knows the truth. The current flows up to the gate, then… nothing. A broken bridge.”