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- DLM02
- Link Module
- Switzerland
- 185 x 313 x 42 mm
- 1.7kg
- P-37421-4-0338434
- Xiamen, China
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ABB DLM02 P-37421-4-0338434 Link Module
Product Overview
The ABB DLM02 P-37421-4-0338434 is a DIN-mount industrial link module that provides high-speed, galvanically-isolated data exchange between field I/O clusters and ABB control processors. Designed for continuous 24 / 7 operation, it handles deterministic peer-to-peer messaging, time-stamped event forwarding, and redundant network fail-over without performance loss. Its rugged metal housing, extended temperature range, and firmware-upgradeable architecture make it a long-lived backbone component for new builds and brown-field expansions alike.
Technical Specifications
| Parameter | Value |
|---|---|
| Model | DLM02 P-37421-4-0338434 |
| Series | ABB Symphony Plus / Freelance Link Family |
| Form Factor | DIN-rail, 35 mm |
| Dimensions (H × W × D) | 185 × 313 × 42 mm |
| Weight | 1.7 kg |
| Supply Voltage | 24 V DC (18…36 V DC tolerated) |
| Power Draw | 9 W typ., 12 W max. |
| Back-plane Interface | 2 × redundant 100 Mbps optical rings |
| Field Bus Ports | 2 × RJ-45 100 Base-TX, 1 × ST duplex fiber |
| Protocols | Modbus TCP, EtherNet/IP™, PROFINET IO Device, ABB HI-Speed Link |
| Event Time-Stamp | 1 ms resolution, IEC 60870-5-104 ready |
| Isolation | 1 500 V RMS port-to-port & port-to-supply |
| Operating Temp. | –25 °C … +70 °C |
| Storage Temp. | –40 °C … +85 °C |
| Humidity | 5 % … 95 % RH, non-condensing |
| Shock / Vibration | IEC 60068-2-27 / -6 compliant |
| Firmware Update | Secure bootloader via USB-C service port |
| Protection | Reverse-polarity, surge, ESD (IEC 61000-4-2 Level 4) |
| Compliance | CE, UL 508, c-UL-us, RoHS, UKCA |
Applications
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Power & Utilities – Links remote I/O racks to Symphony Plus controllers in turbine, boiler and sub-station processes, guaranteeing deterministic trip logic.
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Oil & Gas – Provides low-latency peer messaging between pipeline compressor stations and central SCADA servers, even over mixed copper/optical networks.
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Chemicals & Pharma – Synchronises batch unit skids with plant-wide MES, ensuring secure recipe download and event capture to CFR 21 Part 11 audit trails.
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Water & Wastewater – Bridges distributed pump-station RTUs and central treatment PLCs, maintaining redundancy during fibre or copper link failures.
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Metals & Mining – Handles noisy, long-cable environments, distributing high-speed interlocks between crusher PLCs, conveyor drives and stacker-reclaimers.
Product Advantages
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True Hot-Standby Redundancy – Dual back-plane rings and twin Ethernet ports auto-switch in <50 ms with zero packet loss.
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Field-Upgradeable Security – SHA-256 signed firmware and role-based web GUI protect networks from unauthorised code.
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Massive Throughput Headroom – 4000 packets / s sustained, leaving CPU cycles free for application logic.
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Universal Protocol Gateway – Converts Modbus TCP, PROFINET and EtherNet/IP in a single chassis, reducing gateway count.
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Rugged Mechanics – Zinc-plated steel shell and conformal-coated PCB survive 5 g vibration and corrosive atmospheres.
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Low Lifecycle Cost – 10-year MTBF and tool-free module swap shorten outages and cut spares inventory.
Brand: ABB
ABB is a world leader in electrification and industrial automation. Its Symphony Plus and Freelance control platforms power utilities, marine vessels, and process plants on every continent, renowned for reliability, cybersecurity, and long-term support.
Related Models – Same / Companion Series
| Model | Key Parameters | Typical Use |
|---|---|---|
| DLM01 | 1 × 100 Base-TX, 1 × RS-485; 24 V DC; 150 mm depth | Compact field I/O bridge for brown-field retrofits |
| DLM03 | 4 × fiber ST ports; 48 V DC; –40…+70 °C | Long-haul optical ring concentrator |
| DLM04 | 2 × SFP slots; redundant 24/48 V DC inputs | High-availability gigabit backbone for sub-stations |
| DLM05 | Built-in Profibus-DP master; 16 kV surge isolation | Linking legacy DP slaves to modern DCS |
| DLM06 | Wi-Fi 6 client + 2 × RJ-45; IEC 62443-4-1 compliant | Secure wireless spur for skid units |
Popular ABB Modules
| Model | Primary Function | Notable Specs |
|---|---|---|
| AI931 | 8-ch analog input | 16-bit, HART pass-through, –20…+60 °C |
| TU890 | Field termination unit | 16-slot, quick-disconnect, IP20 |
| BC810K01 | CEX bus interconnection | 127.5 × 185 × 59 mm, 0.77 kg |
| CS513 | Serial / Ethernet gateway | 120 × 80 × 40 mm, Modbus/Profibus |
| DAO01 | 8-ch digital output | 24 V DC / 0.5 A ch., 203 × 51 × 330 mm |
Frequently Asked Questions (FAQ)
Q1：What controllers does the DLM02 support?
A1：Any Symphony Plus AC 800M, Freelance AC 900F, or third-party PLC that speaks Modbus TCP or PROFINET IO.
Q2：Can I mix copper and fiber links on the same module?
A2：Yes. Two copper RJ-45s and one ST fiber port may be used concurrently for redundant paths.
Q3：Is a separate power supply required for redundancy?
A3：The DLM02 accepts dual 24 V DC feeds; if one fails the unit stays online without reboot.
Q4：How do I upgrade firmware?
A4：Connect a laptop to the USB-C service port, authenticate, and load the signed package via the web UI. No plant shutdown needed.
Q5：What cybersecurity features are built in?
A5：Secure boot, TLS-encrypted configuration, role-based access, and Syslog forwarding for audit trails.
Q6：Does the module log diagnostics?
A6：Yes. It stores the last 10 000 events with time-stamp; logs can be exported in CSV or pushed via SNMP traps.
Q7：What is the MTBF?
A7：Calculated MTBF exceeds 150 000 hours at 40 °C per MIL-HDBK-217F.
Q8：Can I daisy-chain two DLM02s?
A8：Absolutely. Use port bonding or ring topology; the module’s RSTP engine prevents broadcast loops.
Q9：What happens if a port is shorted?
A9：Auto-shutdown isolates the fault; other ports continue service and an alarm is flagged to the DCS.
Q10：Is a conformal-coated version available?
A10：All production units ship with silicone coating for chemical and salt-mist resistance.