Description

Yokogawa SB401‑50‑S1 – Bus Interface Module (Exact, Official Spec)

Basic Identity

• Type: ESB Bus Slave Interface Module
• Model: SB401‑50‑S1
• Application: For remote I/O node / local I/O rack
• Connects: I/O modules ↔ FCU (Field Control Unit) via ESB bus
• Suffix meaning:
  • 50: Standard type, non‑explosion‑proof
  • S1: Hardware revision S1

Main Functions

• Establishes ESB bus communication between FCU and I/O modules
• Dual redundant ESB bus support (primary/backup)
• Distributes internal power to I/O modules on the same rack
• Monitors communication status and self‑diagnostics

Compatible Systems

• CENTUM CS 3000
• CENTUM VP
• Used with: ADV551, AAI543, ADM550, AMM12T etc.