Description

The 1MRK001370-DAR01​ (DAR01) is a system module / control unit manufactured by ABB, positioned within the ABB 1MRK protection and control family that spans REG670, REC670, and related bay-level platforms. Classified as a logic-processing system board, it carries a 32K-step processing capacity with Flash 32KB and RAM 2KB, serving as the computational core that executes protection interlocking, automation sequences, and communication tasks inside a bay control cubicle. With RS-232, RS-485, and Ethernet interfaces onboard, the 1MRK001370-DAR01​ bridges field I/O, HMI panels, and upstream SCADA without requiring external protocol gateways at the slot level.Application ScenariosIn a 220 kV step-down substation where an aging electromechanical interlock panel for a 63 MVA transformer had become a maintenance headache—contact welding, undocumented jumper mods, and a complete lack of event timestamps—the utility replaced the panel’s logic section with a 1MRK001370-DAR01​ hosted inside a REG670-based bay controller. The 1MRK001370-DAR01​ took over the transformer cooling-group sequencing (4-stage OA/FA/FA/FA logic), the 52/50/51 interlocking between the HV and LV breakers, and the local/remote hand-off autonomy—all within its 32K-step memory. When a storm-induced load swing triggered sequential cooling-stage transitions, the 1MRK001370-DAR01​ executed the 4-stage ramp with cycle-accurate timing and logged each state change to the event buffer, something the old panel could never do. The protection engineer’s comment after commissioning: “The 1MRK001370-DAR01​ turned a panel full of relays into a configurable logic core—and now we can actually seewhat the interlocks did after the fact.” For bays where “what happened before the trip” is as important as the trip itself, that visibility changes post-fault analysis entirely.

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