Allen-Bradley 1756-DMA31 SynchLink Drive Interface Module | Replacement, Equivalent & Selection Guide
The Allen-Bradley 1756-DMA31 is a ControlLogix-platform SynchLink Drive Interface Module designed to provide high-speed, fiber-optic synchronization between ControlLogix controllers and compatible PowerFlex drives. It occupies a single slot in a 1756 chassis and enables coordinated multi-axis motion and drive control across demanding industrial automation systems.
Selection Background
Procurement engineers and maintenance teams frequently search for 1756-DMA31 replacement or 1756-DMA31 equivalent options when the original module is discontinued, long lead-time, or budget-constrained. Understanding which alternatives are true drop-in replacements versus functional equivalents—and which cross-brand substitutes require engineering review—is critical to avoiding costly downtime. This guide consolidates that intelligence in one place.
Technical Specifications
- Part Number: 1756-DMA31
- Manufacturer: Allen-Bradley / Rockwell Automation
- Platform: ControlLogix (1756 chassis)
- Function: SynchLink Drive Interface – fiber-optic synchronization link
- Backplane Current (5 VDC): 250 mA
- Backplane Current (24 VDC): 0 mA
- Fiber Optic Ports: 1 × SynchLink port (ST connector)
- Communication: SynchLink protocol (proprietary Rockwell)
- Compatible Drives: PowerFlex 700S, PowerFlex 700H (with SynchLink option)
- Operating Temperature: 0 – 60 °C
- Humidity: 5 – 95% non-condensing
- Dimensions: Standard 1756 single-slot module
- Certifications: UL, CE, cUL
- ⚠️ Key Replacement Parameter: SynchLink protocol is proprietary; any substitute must support the same fiber-optic SynchLink interface to achieve drop-in compatibility.
Compatible Replacement & Equivalent Models
1. Direct Drop-in Replacements
Modules that can replace the 1756-DMA31 without firmware or wiring changes:
- 1756-DMA31 (re-manufactured / refurbished) – Identical hardware, tested to OEM spec. Preferred for zero-risk swap.
- 1756-DMA31 (surplus / new-old-stock) – Original Rockwell production units from authorized surplus channels.
2. Functional Equivalents
Modules with equivalent function but may require firmware update or minor configuration change:
- 1756-DMA1 – Earlier SynchLink interface; verify firmware compatibility with your RSLogix 5000 / Studio 5000 project version before substituting.
- 1756-DMA2 – Dual-port SynchLink variant; functionally equivalent for single-link applications, minor EDS/AOP update may be required.
3. Cross-Brand Alternatives
Third-party or alternative-platform options that may serve as substitutes in specific scenarios. Engineering review required before installation.
- Siemens SINAMICS CU320-2 PN + DRIVE-CLiQ – Comparable coordinated drive synchronization on Siemens platform; requires full system re-engineering if migrating from ControlLogix.
- Mitsubishi MELSEC iQ-R Motion CPU – Alternative for multi-axis coordination; not a plug-in substitute, requires platform migration planning.
- Note: Cross-brand alternatives are only viable for greenfield redesigns or full platform migrations. Contact Konmask for a compatibility assessment before proceeding.
Why Choose the Original 1756-DMA31
- Precision Synchronization: Native SynchLink fiber-optic protocol delivers microsecond-level timing accuracy required for coordinated multi-drive applications.
- OEM Certification: UL, CE, and cUL listed; meets IEC 61131-2 and NFPA 79 requirements for industrial control panels.
- Seamless ControlLogix Integration: Plug-and-play with Studio 5000 / RSLogix 5000; no custom driver or EDS file required.
- Rockwell Technical Support: Full TechConnect support eligibility; access to firmware updates, TechNotes, and field service.
- Warranty & Traceability: Genuine modules carry Rockwell’s standard warranty and full manufacturing traceability for regulated industries.
- Long-Term Spares Availability: Konmask maintains verified stock with full test reports, ensuring rapid deployment for emergency replacements.
Typical Applications
- Metals & Mining: Coordinated rolling mill drives requiring tight speed synchronization across multiple PowerFlex 700S axes.
- Pulp & Paper: Section drive synchronization on paper machines where web tension control demands microsecond timing.
- Oil & Gas: Compressor train control with multi-drive coordination via SynchLink in hazardous-area ControlLogix panels.
- Automotive Assembly: Conveyor and transfer line synchronization with PowerFlex drives in body-in-white and paint shop applications.
- Water & Wastewater: Pump station multi-drive coordination for pressure balancing and energy optimization.
- Cement & Aggregate: Kiln and mill drive synchronization where load sharing and speed matching are critical to process stability.
System Compatibility
- 1756-A7 / A10 / A13 / A17 – ControlLogix chassis (any slot)
- 1756-L6x / L7x / L8x – ControlLogix controllers (L61, L71, L83E, etc.)
- 1756-PA72 / PB72 – ControlLogix power supplies
- 20D PowerFlex 700S – Primary compatible drive (SynchLink option card required on drive)
- 20C PowerFlex 700H – Compatible with SynchLink option installed
- Studio 5000 / RSLogix 5000 v16+ – Programming software
- 1756-EN2T / EN3TR – EtherNet/IP communication modules for broader system integration
Selection Guide
Answer these three questions to confirm the 1756-DMA31 is the right fit—or to identify the best replacement:
- Does your drive have the SynchLink option card installed? The 1756-DMA31 requires a SynchLink-capable PowerFlex 700S or 700H. If not, a different interface module or drive upgrade is needed.
- What Studio 5000 / RSLogix 5000 version are you running? Functional equivalents like the 1756-DMA1 may have firmware constraints with newer software versions. Share your project version with Konmask for a compatibility check.
- Is this an emergency replacement or a planned upgrade? Konmask maintains ready stock for emergency dispatch and can provide pre-tested, configured modules for planned maintenance windows.
📩 Not sure which module fits your system? Contact Konmask at [email protected] or +0086 19859288691 for a free selection consultation.
Quality Assurance & Sourcing
All 1756-DMA31 units supplied by Konmask are sourced through verified channels:
- Sourcing Channels: Authorized Rockwell distributors, certified surplus dealers, and OEM-returned stock with full chain-of-custody documentation.
-
4-Step Inspection Process:
- Visual Inspection: Housing, connectors, label, and firmware version label checked against OEM spec.
- Functional Test: Module powered in a live 1756 chassis; backplane communication and SynchLink port verified.
- Firmware Verification: Firmware version confirmed and documented; upgrade available on request.
- Final QC & Packaging: ESD-safe packaging, test report attached, serial number logged.
- Available Documentation: Test report, firmware version record, sourcing declaration, and certificate of conformance (on request).
How to Order
- Submit Your Inquiry: Email [email protected] with part number (1756-DMA31), quantity, and required delivery date—or use the Add to Cart button above.
- Receive Quote & Availability Confirmation: Konmask responds within 24 hours with pricing, lead time, and stock status. Emergency same-day quotes available.
- Confirm & Ship: Upon order confirmation, modules are tested, packaged, and dispatched with full documentation. Express and international shipping available.
Replacement & Compatibility FAQ
Q: Can I use the 1756-DMA1 as a direct replacement for the 1756-DMA31?
A: The 1756-DMA1 is a functional equivalent for most SynchLink applications, but it is an earlier revision. You should verify firmware compatibility with your current Studio 5000 version before substituting. Konmask can assist with compatibility verification.
Q: Is the 1756-DMA31 compatible with all ControlLogix chassis?
A: Yes, the 1756-DMA31 is compatible with all standard 1756-series chassis (A4, A7, A10, A13, A17) and occupies a single slot. It is not compatible with CompactLogix or MicroLogix platforms.
Q: What is the equivalent substitute if the 1756-DMA31 is discontinued or unavailable?
A: For a verified equivalent or substitute, Konmask recommends the 1756-DMA2 (dual-port variant) for single-link use, or a refurbished 1756-DMA31 from certified surplus stock. Contact us to confirm the best option for your specific system configuration.
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Contact: [email protected] | +0086 19859288691
