Description
- ABB CMA123 | OEM Communication Hardware For Profibus DP Network Retrofit
At-A-Glance Executive Brief
- Full Part Number: ABB CMA123
- Component Type: Profibus DP Slave Communication Module
- Host Compatibility: AC 800M Controller, System 800xA platform
- Lifecycle Status: OEM discontinued, limited New Surplus stock
- Core Protocol: Profibus DP Slave (Master operation not supported)
- Installation Style: Plug-in backplane mounting, rack powered
Technical Introduction (Structure B)
Communication breakdown between AC800M controllers and Profibus DP field assets often halts full production lines in legacy process plants.
This interface card establishes bidirectional data exchange between the control rack backplane and external Profibus DP networks. It handles cyclic process data transfer to drives, remote I/O stations and valve positioners. All power draws directly from the rack backplane; no separate auxiliary wiring is needed. Onboard LED indicators display module health, bus activity and detected communication faults. Sites managing obsolescence regularly source this unit to maintain existing Profibus infrastructure without costly full network migration.Engineer’s Takeaway: This hardware only functions as a DP slave. Projects requiring a Profibus DP master need alternate ABB communication modules.
Core Technical Specifications
| Parameter | Value |
|---|---|
| Model | ABB CMA123 |
| Supported Controller | AC 800M (System 800xA) |
| Operating Mode | Profibus DP Slave |
| Supported Baud Rates | 9.6 kbps up to 12 Mbps, auto-detect |
| Power Source | Rack backplane powered |
| Mounting | Plug-in rack slot installation |
| Diagnostic Interface | Multi-status front panel LEDs |
| Compliance | IEC 61158 Profibus DP standard, IEC 61000 EMC |
| Operating Temperature | 0 °C to +55 °C |
ABB CMA123
Field Engineer’s Tech Notes
- Termination resistor placement directly impacts bus stability. Only enable the resistor on modules positioned at the physical endpoints of the Profibus cable run. Duplicate termination creates signal distortion and intermittent dropouts.
- Hot removal while the rack remains energized disconnects the entire Profibus DP segment. Schedule a controlled equipment shutdown before swapping the CMA123 to avoid unexpected field device offline events.
Adaptive QA & Testing Protocol
Each CMA123 undergoes a full rack bench test using a functional AC800M controller. Technicians configure a defined Profibus station address and validate stable DP slave handshake at multiple baud rates. All status LEDs are verified for correct operating and fault state indication. Physical connector continuity checks complete the procedure. Test screenshots or short verification video can be shared before shipment upon request.
Buyer’s FAQ
Q: Can the CMA123 serve as a Profibus DP master?No. Hardware firmware restricts operation to slave mode. Select alternative communication modules if master functionality is required.
Q: Is this module a direct physical swap for other ABB rack communication cards?It fits standard AC800M rack slots, but protocol differences prevent plug-and-play replacement with modules such as CMA152. Program adjustments are required for cross-model swaps.
Q: What warranty applies to this spare part?All units carry a 12-month warranty starting on dispatch date. Damage from electrostatic discharge, miswiring or overvoltage voids coverage.
Q: What condition is available inventory?Stock consists of New Surplus units with no prior field installation. Refurbished inventory is not offered for this part at this time.
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