ABB PMKHRMBRC3000B

The ABB PMKHRMBRC3000B is a Remote I/O Communication Interface Module. It acts as the central communication gateway for an ABB Advant Controller 400 (AC 400) or Melody Harmony series remote I/O station (specifically, the Harmony Rack MB/RC).

Its primary function is to manage all data exchange between the field instruments (connected to I/O modules in the same rack) and the higher-level master controller (e.g., an AC 400 or a DCS) via a MasterBus 300 (MB 300) network.

Key Technical Parameters

Here is a structured table of its core technical specifications:

Detailed Explanation of Key Features

MasterBus 300 (MB 300) Interface:
 

This is a deterministic, token-passing fieldbus protocol.

It is designed for high reliability and real-time performance in critical process automation applications (e.g., chemical, oil & gas, power generation).

The network topology is typically a redundant bus or ring structure for increased availability.

The 1.5 Mbit/s speed was very high for its time and ensures fast scan times for the entire remote I/O station.

Rack Controller Function:
 

The module scans all I/O modules in its rack, reading input values and writing output values.

It handles the configuration and diagnostics of the individual I/O modules.

It is the "brain" of the remote I/O station, making the rack an intelligent slave device on the MB 300 network.

Redundancy (Optional):

While the PMKHRMBRC3000B itself is a single module, the MB 300 network can be configured with redundant communication paths. For a fully redundant I/O station, a complete second rack with its own communication module would be used.

Configuration:

The module and the entire I/O rack are configured using ABB's engineering tools, historically Advant Station or later tools like System 800xA with the appropriate connectivity and configuration packages. The configuration defines the I/O addressing and mapping to the master controller's database.

Typical Application

This module is a key part of a distributed control architecture:

A central AC 400 controller acts as the master on the MB 300 network.

Several remote I/O stations (each with a PMKHRMBRC3000B module in a Harmony Rack) are placed close to the field devices (sensors, valves, motors) throughout the plant.

The master controller communicates with these remote stations over the MB 300 network to read process values and send control commands.

This architecture significantly reduces wiring costs and centralizes control logic.

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