ABB BAILEY BRC-100 controller P-HC-BRC-10000000 BRC100

ABB BAILEY BRC-100 controller P-HC-BRC-10000000 BRC100

Instructions

The BRC module incorporates the power of a second generation 32-bit microprocessor operating at 32 megahertz. This is

coupled with 32-bit wide memory design with an optimized interface. The microprocessor supplies superior performance capable of supplanting the need for external mainframes or minicomputers.

Control input/output is available from I/O blocks using Hnet or from Harmony rack I/O modules using the I/O expander bus. The data within the BRC module may be exported to the Cnet communication network and to existing INFI-NET and Plant Loop communication systems.

In some processes, the effects of a control failure in the system can create dangerous situations or cause economic loss. To reduce the possibility of these problems occurring, redundant modules provide fail-safe control. Redundant BRC modules link directly to each other via the processor bus adapter (PBA) board or the BRC redundancy kit to keep the database in the backup module current. Each module uses a redundant high speed communication channel to accomplish this function. 

If the primary module fails, the backup module is waiting in standby mode and immediately takes over. The backup module has the same control strategy loaded in its memory as the primary BRC module and is ready to assume control. When operating in Hnet communication mode, the redundant communication channel insures that single point failures will not prevent the backup module from being in a state of readiness to take over.

While the BRC module is controlling a process, it also executes diagnostic routines. It is constantly checking the integrity of its  2 - 2 WBPEEUI230017B1 Circuitry hardware and firmware during normal operation. 

If the diagnostic routines discover a module hardware or software problem, it makes that information available to the operator.

The operator has access to this information through status LEDs on the module faceplate and through reports received on the human system interface (HSI) in module status bytes.

Microprocessor

The microprocessor is responsible for module operation and control. The BRC microprocessor is a 32-bit processor that runs from a 32-megahertz clock. The microprocessor executes synchronous access to long word memories and an asynchronous access to all byte ports. Since the microprocessor is responsible for module operation, icommunicates with all blocks of the BRC circuitry. The microprocessor operating system instructions and the function code library reside in the read only memory (flash ROM). 

The microprocessor carries out all control responsibilities as it executes the control strategy set up in its function block configuration.

The microprocessor constantly triggers the machine fault timer(MFT) circuit. If the microprocessor or software fails, the MFT circuit times out, issues a board wide reset, and the statusLED turns red. This condition is a fatal module error.