Description
The ABB 1MRK001370-DAR01 (commonly called the DAR01 board) is an internal rear-panel system and communication interface module designed for ABB REx670 V2.x series protection and control IEDs (REG670, REL670, RET670, REC670). It provides the physical layer and protocol handling for station-level communication—supporting IEC 61850 (GOOSE / MMS via optical fiber or RJ-45), ABB SPA bus, and Modbus RTU/TCP—as well as the local service port (USB / RS-232) and time-synchronization inputs (IRIG-B / SNTP / PPS). The board plugs into the rear of the relay / bay unit housing and interfaces with the main CPU board via the internal backplane.h2 Application ScenariosPicture a 400 kV substation where an ABB REG670 line-protection IED suddenly drops off the IEC 61850 station bus while the protection functions themselves continue to operate—a classic symptom of a failed communication board. The relay’s GOOSE subscriptions time out, alarming the SCADA, and the engineer can no longer download settings remotely. Rather than replace the entire IED (which would require reloading the SCL file, re-mapping GOOSE, and scheduling a protection outage), the team sources a version-matched ABB 1MRK001370-DAR01 (DAR01 revision). With the DC supply isolated, the rear cover is removed, the old PCB is extracted from its guide slots, and the new 1MRK001370-DAR01 is seated on the rear-frame connectors. On power-up, the board is auto-recognized; the existing MAC / IP / VLAN configuration stored in the CPU’s non-volatile memory is applied automatically, and GOOSE traffic resumes within seconds. This scenario highlights the 1MRK001370-DAR01‘s strategic value: it is the targeted, low-cost spare that restores full station-communication capability without disturbing the commissioned protection logic.h2
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | 1MRK001370-DAR01 (DAR01 Revision) |
| Manufacturer / Origin | ABB / Switzerland (CH) |
| Product Category | Internal System & Communication Interface Module (Rear PCB) |
| Compatible Host Devices | ABB REx670 V2.x (REG670, REL670, RET670, REC670) — verify host type & rear-slot layout |
| Supported Protocols | IEC 61850 Ed.1/Ed.2 (GOOSE, MMS), ABB SPA bus, Modbus RTU (RS-485) / Modbus TCP (Ethernet) |
| Ethernet Interfaces | 2 × 100Base-FX (ST or LC fiber, model-dependent) + 1–2 × 10/100Base-TX (RJ-45, model-dependent) |
| Serial / Service Ports | 1 × RS-232 / USB service port (front or rear accessible per host), 1 × RS-485 (SPA / Modbus RTU) |
| Time Synchronization Inputs | IRIG-B (dc), PPS (Pulse Per Second), SNTP via Ethernet |
| Supply Voltage | 24 / 48 / 110 / 220 V DC (derived from host relay internal power supply) |
| Isolation | Galvanic isolation on Ethernet / Serial ports (≥ 1500 V RMS typical) |
| Operating Temperature | -20 °C to +70 °C (per host IED specification) |
| Mounting Method | Plug-in mount on rear frame of REx670 bay unit / relay housing |
| Dimensions (approx.) | 130 × 95 × 25 mm (reference — verify against removed board) |
*Note: Exact port count (LC vs ST fiber, number of RJ-45s), protocol license enablement, and rear-faceplate cutout must be confirmed by comparing the removed board photo and host device nameplate before ordering.h2 Technical Principles and Innovative ValuesThe 1MRK001370-DAR01 is a protocol-acceleration and physical-interface board, offloading real-time messaging from the main protection CPU.
- Innovation Point 1 – Dual-Port Ethernet with IEC 61850 Redundancy: The 1MRK001370-DAR01 supports two independent 100 Mbps Ethernet ports (optical and/or copper) enabling station-bus redundancy (RSTP / PRP/HSR in later firmware). GOOSE multicast frames are hardware-timestamped at the MAC layer, ensuring μs-level precision for breaker-tripping and interlocking messages—far superior to software-stack timestamping.
- Innovation Point 2 – Multi-Protocol Coexistence on a Single Board: The same board concurrently handles IEC 61850 MMS for SCADA/engineering, GOOSE for peer-to-peer protection signalling, legacy ABB SPA telegrams for backward-compatible bay-level communication, and Modbus for third-party HMI/RTU links. This eliminates the need for external protocol gateways in mixed-vintage substations and simplifies cabling.
- Innovation Point 3 – Transparent Swap Preserves All Network Settings: All communication parameters (IP, subnet, VLAN ID, GOOSE APPID, SCL configuration reference) are stored in the relay’s main CPU non-volatile memory—not on the 1MRK001370-DAR01. Swapping the board requires no re-entry of network settings; the replacement board is enumerated on the backplane at boot and inherits the existing configuration, minimizing commissioning risk and MTTR.
