Field Control I/O was a rugged, DIN‑rail‑mounted distributed I/O system that GE promoted for process industries such as water treatment. The modules integrated terminal blocks and electronics in a compact housing, saving panel space and wiring. But the line is obsolete and no longer made; you’re dependent on spare parts and repairs. While it’s still serviceable for existing plants, engineers designing new systems should adopt newer remote I/O solutions that support modern protocols and better diagnostics.