ABB PM864A central processing unit
Harmony BRC Controller FeaturesForm, fit & functional equivalent for Harmony rack controllers
Deploys advanced Reduced Instruction Set Computer (RISC) microprocessor
technology - Motorola 32-bit Coldfire
Retains Harmony controller (BRC, MFP, etc.) hardware and software architecture
Enhanced controller reliability
Provides approximately (2x) function code execution rate vs.BRC100,(4x) vs. MFPxx,
and (8x) vs.MFCxx
Extended user configuration memory; 30,000 function blocks(BRC400 version)
Preserves existing control logic configurations, providing predictable and risk-free evolution:
Function code execution
Custom user programs
Foreign devioe interfaces
Fast fail-over redundancy
High availability and fault tolerance in a redundant pair configuration
Controller configuration supported by the Composer engineering tool
Supports all Harmony I/0 systems, simultaneously providing support for installed I/O systems
and expansions:
Rack I/O
Block I/O
S800 I/O (System 800xA)
Support for Module Bus and Controlway communications
Figure 3.Bridge Controller Family(BRC300,BRC400)
Harmony Rack I/O. The Harmony Rack I/O family includes a wide variety of input,
output, and signal conditioning modules. Module types,ranging from standard analog
and digital I/O to specialty I/O such as turbine control, and Sequence of Events (SOE),
can be combined to provide a comprehensive set of functionality to meet all market and
industrial requirements. Additionally, the Harmony remote I/O capabilities have been
enhanced with the addition of S800 I/O (see section“S800 I/O for Harmony" for details).

Another example of ABB's continuing commitment to protect investments made
in Harmony system assets is found in the recent introduction of a Rack Remote I/O
alternative. Needed to protect the more than 20 year investments made in the rack
remote I/O IMRIO02 module, this new alternative minimizes the change impact to
existing hardware architectures. Specifically, the new Rack Remote I/Oalternative
leverages newer H.Net technology for remote communications and requires minimal
change to the Remote I/O interface block (FC 146). The Rack Remote I/O alternative
supports multiple RIO links and can be mixed with the other Harmony I/O types:
Rack, Block, or S800 I/O. The Rack Remote I/O alternative supports multiple RIO links
and can be mixed with the other Harmony I/Otypes: Rack, Block, or S800 I/O.The
Rack Remote I/O architecture is summarized in Figure 4.
Harmony Communications. New communication modules ensure the long term
viability of new and installed systems. As the flagship PCU Communication products,
the INNIS21/INNPM22 modules provide significant increases to performance and
capacity compared to previous generations. Additionally, new INFI-NET to Computer
Interface and INFI-NET to INFI-NET Local and Remote Bridge modules are available.
All of these communication modules are form, fit, functional replacements of their
predecessors.