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Product Core Brief
- Model: CMA126 (3DDE300406)
- Brand: ABB
- Series: Synpol D
- Core Function: Multi-protocol industrial communication
- Product Type: Interface communication card
- Key Specs: 24 V DC | 5 W | RS485/Ethernet/Modbus | -20 to +70°C
- Condition: New Surplus (factory sealed, original packaging).
- Inventory Status: EOL buffer stock for legacy DCS systems; strategic last-time-buy advised.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Product Type | Communication Interface Card |
| Part Number | 3DDE300406 |
| Power Supply | 24 V DC |
| Power Consumption | 5 W |
| Protocols | RS485, Ethernet, Modbus RTU, Profibus |
| Data Rate | 10/100 Mbps Ethernet |
| Operating Temperature | -20°C to +70°C |
| Dimensions | 120 x 80 x 60 mm |
| Weight | 0.1-1.5 kg |
| Humidity | 0-95% non-condensing |
| Compliance | CE, UL, IEC 61131-2, EN 50178 |
| Applications | DCS, automation, power distribution |
- CMA126
Product Introduction & Supply Chain Strategy
The ABB CMA126 is a communication interface card for Synpol D and industrial DCS systems, enabling multi-protocol connectivity via RS485, Ethernet, Modbus RTU, and Profibus. It facilitates real-time data exchange between controllers, field devices, and SCADA in power distribution, automation, and process control environments.
New Surplus secures supply for discontinued legacy interfaces, minimizing TCO by preventing refurbished card failures like protocol timeouts that halt production. Buffer min/max 1/2 units at 40-50% below OEM list; 1-year warranty avoids $10k+ diagnostic costs from degraded ports.
Installation & Configuration Guide
Stage 1: Pre-Installation (Prep & Safety)
Lock out/tag out DCS rack power. ESD strap mandatory. Photo existing RS485/Ethernet wiring, terminator settings, protocol configs (Modbus address, baud). Verify 24 V DC supply with 20% buffer.
Stage 2: Removal
Disconnect all field cables (RJ45/RS485 terminals). Release mounting screws; extract card straight to protect edge connector pins. Inspect for corrosion.
Stage 3: Installation (Clone & Seat)
Replicate wiring per photos: Ethernet CAT5 to RJ45, RS485 A+/B-/GND. Secure with 0.5 Nm torque; set DIP switches for baud/protocol match.
Apply 24 V; check power LED steady. Ping Ethernet IP; test Modbus poll (register read/write), Profibus scan—no comms faults via DCS diagnostic
Firmware/Software Versions & Upgrade Notes
No user-upgradable firmware; protocol stack embedded for Modbus RTU V1.x, Profibus DP-V0. Matches ABB DCS engineering tools V4.x+.
Version jumps risk register mapping errors; document slave addresses pre-swap. Test full data exchange at low baud first—no downgrades supported.
Frequently Asked Questions (FAQ)
Is this genuine New Surplus?
Yes—factory sealed with pristine connectors, full QC including continuity test. Skips refurbished port oxidation causing packet loss.
Why mid-price vs OEM/cheap used?
Global last-time-buy sourcing 40-50% off list; verified multi-protocol vs. junk with intermittent dropouts costing troubleshooting hours.
EOL status for CMA126?
Legacy Synpol D component; stock 1-2 via frame agreements for slow-mover reliability.
Hot-swap supported?
No—full power cycle prevents bus conflicts. Live insertion risks protocol stack crash
Config transfers on swap?
Params in host DCS; card hardware only. Backup Modbus slave tables first.
