Schneider Electric Modicon NW-BM85-000

Product Name
Modicon BM85 Bridge Multiplexer NW-BM85-000
Product Introduction
Industrial serial bridge and multiplexer for Modicon automation networks. Connects multiple RS-232 devices and routes Modbus / Modbus Plus traffic between controllers, SCADA hosts and field devices.
Category:
Description
Technical Specifications
Ports: 4 × RS-232
Device Type: DTE
Modbus Role: Master / Slave
Network Support: Modbus, Modbus Plus gateway functions
Power Supply: 115 VAC or 230 VAC selectable
Mounting: 19″ rack / Modicon chassis
Weight: approx. 2.27 kg
Functional Features
Multiplexes several serial channels
Protocol routing and message forwarding
Modbus master/slave operation
Modbus Plus bridging
Legacy PLC integration
Centralized serial concentrator
Application Scenarios
Legacy Modicon PLC networks
SCADA serial concentrators
Retrofit process automation
Multi-device Modbus integration
Factory network gateways
Performance Parameters
Baud Rate: standard Modbus serial rates
Node Addressing: Modbus node dependent
Throughput: legacy serial bridge class
Latency: serial frame processing level
Material / Structure
Metal industrial enclosure
D-sub / serial front ports
AC power entry
Modbus Plus interface option
Rack-mount hardware
Working Principle
Devices connect to RS-232 ports. The BM85 parses Modbus frames, assigns routing, and forwards messages between serial ports and Modbus/Modbus Plus networks. It can initiate polls as master or reply as slave.
Installation Requirements
Select 115/230 VAC before power
Mount in rack or control cabinet
Use straight-through cable DTE to DCE
Use null-modem cable DTE to DTE
Set Modbus node address and port parameters
Usage Notes
Wrong cable type causes no comms
Avoid duplicate Modbus addresses
Backup configuration before service
Keep firmware/EEPROM image safe
Shield and ground serial cables
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