DescriptionThe ABB 1MRK000173-CCR00​ (also referenced as 1MRK000173-CCr00) is an internal Binary Input/Output (I/O) printed circuit board module engineered by ABB for use inside REx670 V1.1 protection and control relays, bay units, and selected industrial automation systems. It acquires eight discrete field contact signals—such as breaker positions, local/remote selector switches, and protection inhibit pushbuttons—while providing twelve digital outputs (ten standard + two specialized trip/close-type outputs) to drive internal relay functions or external indication. Manufactured to Swiss industrial standards, it is a key interface between the relay’s main processing unit and the switchyard binary signals.h2 Application ScenariosConsider a 220 kV substation where an ABB REx670 line-distance protection relay manages a critical transmission line. During a routine secondary-injection test, the relay’s binary input self-test fails on three channels—traced to degraded input-filter components on the internal I/O board. Replacing the entire relay would mean reloading the complete SCL configuration, re-mapping GOOSE subscriptions, and scheduling an outage. Instead, the protection engineer orders a version-matched ABB 1MRK000173-CCR00 (CCR00 revision). With the DC trip supply isolated, the relay lid is opened, the old PCB is unplugged from its guide pins and header connectors, and the new 1MRK000173-CCR00​ is seated. The relay boots, passes all self-tests, and the existing configuration—stored on the main CPU—remains completely intact. All eight binary inputs and twelve outputs function correctly within minutes. This scenario demonstrates the 1MRK000173-CCR00‘s essential role: it is the economical, low-risk spare that restores full binary-signal capability to mission-critical protection assets without re-engineering or re-commissioning.h2

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*Note: Exact connector arrangement, output drive capability (solid-state vs. relay), and DI threshold must be verified against the removed board and host device nameplate before installation.h2 Technical Principles and Innovative ValuesThe 1MRK000173-CCR00​ is a purpose-built embedded binary I/O interface—not a standalone PLC module—tightly coupled to the host relay’s processing architecture.

• Innovation Point 1 – Noise-Immune Filtered Binary Inputs: Each of the eight DI channels incorporates hardware RC filtering plus programmable software debounce. This rejects contact bounce from mechanical switches and suppresses EMI/RFI transients common in high-voltage switchyards, ensuring only legitimate state changes are passed to the protection algorithm—critical for avoiding false trip or block commands.
• Innovation Point 2 – Dedicated High-Duty Trip/Close Outputs: Of the twelve outputs, two are designated as specialized (trip/close-type) with reinforced drive capability and separate monitoring. This segregation allows the 1MRK000173-CCR00​ to directly support critical protection commands while the remaining ten standard outputs handle annunciation, LED drives, or auxiliary relay coils—matching the functional partitioning expected in IEC 61850-compliant bay units.
• Innovation Point 3 – Transparent Swap with Zero Configuration Transfer: All application logic, binary point configuration (NO/NC polarity, pulse width, AND/OR gating), and communication mappings reside on the relay’s main CPU/configuration memory—not on the 1MRK000173-CCR00. A board swap requires no parameter download or re-addressing; the replacement is automatically recognized on power-up, minimizing MTTR during emergency interventions.