Fanuc Ladder | [2021]

Arjun sighed. A-40 was the ghost of Line 4. It meant one of the forty-seven relays in the safety circuit had failed, but the ladder logic couldn’t tell him which one. It only knew that current wasn’t flowing across Rung 117.

Arjun Singh, the senior controls engineer at Osaka Die Casting’s Chon Buri plant, was the only one who still spoke its language. To the young technicians with their touchscreen HMIs and Ethernet IP addresses, the FANUC was a black box of cryptic green-on-black text and rungs of logic that looked like an ancient scroll. fanuc ladder

He navigated to the diagnostics. The screen displayed a grid of contacts and coils. Arjun sighed

The old injection molding press wheezed like an emphysemic giant. Its hydraulic pumps groaned, and its safety gates rattled. For twenty years, it had stamped out dashboard panels, and for twenty years, it had been controlled by a relic: a FANUC Series 15 controller, running a ladder logic program burned into EPROM. It only knew that current wasn’t flowing across Rung 117