Process & Motion Control Solution — Allen-Bradley 1756-L71/B | ControlLogix Series
Where This Product Is Used
The Allen-Bradley 1756-L71/B ControlLogix controller is deployed across demanding industrial environments where deterministic control, high-speed I/O coordination, and multi-discipline integration are non-negotiable. Typical deployment sites include:
- Oil & Gas Processing Plants — Pipeline SCADA, compressor station control, and wellhead automation requiring SIL-rated safety integration.
- Automotive Assembly Lines — Coordinated motion control for robotic welding cells, conveyor sequencing, and vision-guided pick-and-place stations.
- Water & Wastewater Treatment — Pump station management, chemical dosing control, and remote telemetry via EtherNet/IP.
- Food & Beverage Production — Batch processing, CIP (Clean-In-Place) sequencing, and hygienic filling line control under FDA/HACCP compliance.
- Power Generation & Utilities — Turbine governor control, switchgear automation, and substation protection relay coordination.
- Pharmaceutical Manufacturing — 21 CFR Part 11-compliant batch control, environmental monitoring, and serialization line management.
- Mining & Minerals Processing — Crusher control, conveyor load management, and flotation cell automation in harsh environments.
Technical Specifications
| Parameter | Specification |
|---|---|
| Catalog Number | 1756-L71/B |
| Series | B |
| Platform | ControlLogix 5570 |
| User Memory | 2 MB |
| I/O Memory | 478 KB |
| Tasks Supported | 32 (Continuous, Periodic, Event) |
| Max I/O Modules (Local) | Up to 31 modules per chassis |
| Communication Ports | 1 × USB (programming), EtherNet/IP via 1756-EN2T |
| Backplane Current Draw | 1.2 A @ 5 VDC; 3.0 mA @ 24 VDC |
| Operating Temperature | 0 °C to 60 °C (32 °F to 140 °F) |
| Storage Temperature | -40 °C to 85 °C |
| Relative Humidity | 5% to 95% (non-condensing) |
| Enclosure Rating | Open type — requires IP54 or better enclosure |
| Programming Software | Studio 5000 Logix Designer v21+ |
| Supported Languages | Ladder Diagram, Function Block, Structured Text, Sequential Function Chart |
| Weight | Approx. 400 g |
| Certifications | UL, CE, C-Tick, ATEX (Zone 2 with 1756-A4/B4 chassis) |
Why Engineers Specify This Model
- 2 MB User Memory — Sufficient for complex multi-axis motion programs, large PID loops, and extensive HMI data tables without memory expansion modules.
- Series B Reliability — Incorporates hardware revisions addressing early-series firmware edge cases; preferred by system integrators for greenfield and retrofit projects.
- Integrated Motion & Process Control — Single controller handles CIP Motion (Sercos/EtherNet/IP drives), process PID, and safety logic via GuardLogix upgrade path.
- Scalable Architecture — Supports up to 31 local I/O modules and unlimited remote I/O racks via ControlNet or EtherNet/IP, future-proofing plant expansions.
- Redundancy Ready — Pairs with 1756-RM2/A redundancy module for hot-standby configurations in critical process applications.
- Proven Ecosystem — Seamless integration with Rockwell’s FactoryTalk View, AssetCentre, and Historian platforms for full MES/SCADA connectivity.
Complete System Bill of Materials
A fully operational ControlLogix system around the 1756-L71/B typically includes:
- 1756-A7 / 1756-A10 — 7-slot or 10-slot ControlLogix chassis
- 1756-PA75 / 1756-PB75 — 120/240 VAC or 18–32 VDC power supply
- 1756-EN2T — EtherNet/IP communication module (dual-port)
- 1756-IB16 / 1756-OB16E — 16-channel DC input / output modules
- 1756-IF8 / 1756-OF8 — 8-channel analog input / output modules
- 1756-RM2/A — Redundancy module (for high-availability systems)
- 1756-TBCH / 1756-TBS6H — Removable terminal blocks for field wiring
- Studio 5000 Logix Designer — Programming and configuration software license
Compliance & Industry Standards
- IEC 61131-3 — Compliant programming language standard
- IEC 61508 / IEC 61511 — Safety Integrity Level (SIL) pathway via GuardLogix variant
- UL 508 — Industrial Control Equipment listing
- CE Marking — EMC Directive 2014/30/EU; Low Voltage Directive 2014/35/EU
- ATEX / IECEx — Zone 2 hazardous area use with approved chassis and barriers
- RoHS Compliant — Restriction of Hazardous Substances Directive
- 21 CFR Part 11 — Electronic records/signatures support via FactoryTalk Audit
Quality Assurance & Sourcing
Konmask.com sources the 1756-L71/B exclusively through verified industrial distribution channels. Every unit undergoes the following before dispatch:
- Visual inspection for physical damage, label integrity, and firmware version verification
- Functional power-on test confirming LED status and backplane communication
- Anti-static packaging with humidity indicator cards for long-haul shipping
- Traceability documentation available upon request (lot code, date code, origin)
We do not source from grey-market or unverified secondary channels. All stock is maintained in climate-controlled storage compliant with Rockwell Automation’s recommended storage conditions.
How to Source This Part
- Add to Cart — Select quantity and proceed to checkout. Volume pricing available for orders of 3+ units.
- Request a Quote — For project BOM quantities or lead-time-sensitive procurement, email support@konmask.com with your project timeline.
- Expedited Sourcing — If the part is shown as out of stock, contact us directly. We maintain supplier relationships that can fulfill urgent requirements within 5–10 business days.
- Export Documentation — We provide commercial invoices, packing lists, and ECCN classification support for international shipments.
Application-Specific FAQ
Q: Can the 1756-L71/B be used as a safety controller?
A: Not directly. For SIL 2/3 safety applications, specify the 1756-L71S GuardLogix variant, which includes the integrated safety partner processor. The 1756-L71/B can coexist in the same chassis as a standard controller alongside a GuardLogix unit.
Q: What is the maximum number of axes this controller can coordinate?
A: With 2 MB of user memory, the 1756-L71/B can typically manage 16–32 coordinated CIP Motion axes depending on program complexity and scan rate requirements. Consult Rockwell’s Motion Analyzer tool for project-specific sizing.
Q: Is this controller compatible with older 1756-L6x programs?
A: Yes. Studio 5000 Logix Designer supports project migration from 1756-L6x (ControlLogix 5560) to 1756-L7x (ControlLogix 5570) with minor revision updates. I/O module compatibility is maintained across generations.
Q: What firmware version ships with this unit?
A: Units are shipped with the firmware version current at time of manufacture. Firmware upgrades to the latest v32.x or v33.x are performed via ControlFLASH or Studio 5000 using a USB or EtherNet/IP connection.
Q: Can I use this in a redundant configuration?
A: Yes. Pair two 1756-L71/B controllers with 1756-RM2/A redundancy modules and 1756-SYNCH fiber-optic synchronization cables. Requires Enhanced Redundancy System firmware and ControlLogix Redundancy Update and Transfer Tool (RUAT).
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