Description
Metso D201483
Technical Specifications Power supply from rack 28 V DC backplane; RS485 serial communication interface; galvanic isolation between rack bus and field serial lines; operating temperature -20 ℃ to +70 ℃; uncoated FR4 PCB; rack plug-in compatible with Metso MAX backplane; front panel transmit and receive activity LED indicators; non-volatile memory for station address and baud rate configuration.
Functional Features Configurable master or slave Modbus RTU operation; hardware isolation eliminates field ground loop damage; serial data buffering and error detection for parity and framing faults; front panel LED traffic indication; non-volatile storage of communication parameters; cyclic data exchange between rack CPU and remote serial devices.
Application Scenarios Central control room third-party instrument Modbus networking, power plant auxiliary equipment serial data collection, clean water treatment remote instrument communication, Metso MAX DCS retrofit spare replacement.
Material Composition Flame-retardant plastic module housing; uncoated FR4 signal PCB; isolated serial transceiver chips; surge suppression components; gold-plated rack backplane edge connector; removable screw terminal blocks for field serial wiring.
Structural Characteristics Horizontal rack plug-in module; front panel equipped with communication activity LEDs and field signal terminal block; rear gold finger connects to Metso MAX internal backplane bus; isolation barrier separates rack digital ground and field instrument signal ground.
Working Principle The module receives data packets from rack CPU over backplane bus. Protocol controller packages data into serial frames and transmits to remote field instruments over RS485 lines. Received serial field data is validated, buffered and forwarded to rack CPU. Isolation circuits block ground loop current between control cabinet and field instrument locations.
Installation Requirements Insert module into de-energised Metso MAX rack; set Modbus address and baud rate in DCS configuration software; use shielded twisted pair cable for RS485 wiring; install bus terminating resistor at both physical ends of the serial bus.
Operation Notes Back up communication configuration before module replacement; verify RS485 differential line polarity after wiring changes; use coated variant for high-humidity field plant cabinets.
