Schneider NW-BM85C002

Product Name: Modicon BM85 Bridge Multiplexer (Modbus Plus to Serial Modbus Gateway)

Product Introduction: Legacy but widely installed communication bridge letting Modbus RTU/ASCII field devices appear as nodes on a 1 Mbps Modbus Plus token network for Modicon Quantum/Premium platforms.

Description

Technical Specifications:

MB+ port: 1 × Modbus Plus (RG-178 coax or drop cable)
Serial ports: 1 × RS-232 (DB9), 1 × RS-485 (terminal)
Protocols: Modbus RTU, Modbus ASCII, MB+ passthrough
Max slaves: 32 across ports
Baud: 300–38400 bps per serial port
Config: DIP switches + rotary node selector (no PC needed)
Power: 115/230 V AC ±15 % or 24 V DC ±15 % (10 W)
Temp: 0–60 °C operating, −40–80 °C storage
Mount: DIN rail or panel, horizontal/vertical
Size: 2.59 × 11.50 × 8.30 in (bracket 14.08 in W)
Weight: 2.5 kg

Functional Features: Autonomous polling, LED diagnostics, conformal-coated PCB, MB+ powered option on some variants.

Working Principle: Maps serial slave registers into MB+ global data table; token pass grants deterministic access.

Installation: Set node ID via rotary switch before power; terminate MB+ cable with 75 Ω; isolate RS-485 with proper bias resistors.

Usage Notes: Do not assign duplicate MB+ node addresses; legacy unit—keep spare for brownfield continuity; avoid mixing with modern Ethernet/IP without outer gateway.

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