PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1756-L61 LOGIX5561 is a ControlLogix Controller Module designed for industrial automation platforms. It provides 2 MB of user memory for logic and data storage. The unit also includes 478 KB dedicated to I/O processing tasks. Users can install one or multiple controllers in any slot of a standard ControlLogix chassis. The processor architecture divides execution between a dedicated Logix CPU and a backplane CPU.
This controller module achieves a program scan time of 0.08 milliseconds. It handles up to 128,000 total digital I/O points across the control system. Maximum analog capacity reaches 4,000 inputs and 2,000 outputs. Diagnostic routines feature an onboard fault handler and an I/O status indicator. Nonvolatile memory storage is supported using an optional 1784-CF64 CompactFlash card. Backplane power draw is 1.2 Amps at 5 Volts DC and 14 milliamps at 24 Volts DC.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
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| Category | PLCs |
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| Weight | 2.00 lbs (0.91 kg) |
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| Module Type | Logic Controller Module |
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| Fixed Memory | 2, 4, or 8 MB |
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| Nonvolatile Memory | See Compact Flash Card 1784-CF64 |
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| Maximum I-O | 128,000 |
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| Maximum Analog I-O | 4,000 Input, 2,000 Output |
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| Program Scan Time | 0.08 milliseconds |
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| Backplane Current (5Volts DC) | 1.2 Amps |
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| Backplane Current (24 Volts DC) | 14 milliamps |
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| Vibration | 10-500 Hertz |
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| Relative Humidity | 5-95 percent |
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| Battery | 1756-BA1 or 1756-BATM |
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TECHNICAL INFORMATION
Features
- Multitasking operating system allows processing time allocation across different application tasks.
- Dual-CPU structure separates backplane communication handling from primary logic processing routines.
- Supports Logix5000 programming languages for online and offline application engineering.
- Integrated fault handler and front-panel status LEDs provide immediate system diagnostic information.
- Nonvolatile backup options include compatible 1784-CF64 CompactFlash memory cards.
TECHNICAL INFORMATION
Applications
- Industrial plant automation using high-density discrete and analog process control networks.
- Distributed control architectures communicating over EtherNet/IP, ControlNet, or DeviceNet networks.
- Multi-controller ControlLogix chassis setups requiring system-shared tag exchange.
TECHNICAL INFORMATION
Connections / Interfaces
- Installs directly into any open slot of a standard Allen-Bradley ControlLogix chassis.
- Serial workstation connection interfaces via a 1756-CP3 serial communication cable.
- Network communication integrates via EtherNet/IP, ControlNet, and DeviceNet bridge modules.
TECHNICAL INFORMATION
Installation Guidelines
- Insert the controller firmly into the chosen chassis slot until the locking latches engage.
- Install a 1756-BA1 or 1756-BATM battery assembly to maintain memory retention during power outages.
- Maintain ambient relative humidity between 5 and 95 percent noncondensing during operation.
TECHNICAL INFORMATION
Configuration Guidelines
- Configure controller properties, tasks, and routines using RSLogix 5000 software.
- Establish shared tags across network bridges for peer-to-peer data broadcasting.
- Configure optional CompactFlash nonvolatile image loads via programming project properties.
TECHNICAL INFORMATION
Compatibility
- Mounts in standard Allen-Bradley 1756 ControlLogix chassis racks.
- Uses 1756-BA1 and 1756-BATM battery assemblies for memory backup.
- Compatible with 1784-CF64 nonvolatile CompactFlash memory cards.
- Connects to programming terminals using the 1756-CP3 serial communication cable.
TECHNICAL RESOURCES
Documentation
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSMounts in standard Allen-Bradley 1756 ControlLogix chassis racks. Uses 1756-BA1 and 1756-BATM battery assemblies for memory backup. Compatible with 1784-CF64 nonvolatile CompactFlash memory cards. Connects to programming terminals using the 1756-CP3 serial communication cable.
Verify compatibility against the exact Part Number, revision and manufacturer documentation before ordering.
PART VERIFICATION
Before You Order
Industrial automation parts can share similar model names, suffixes and revisions. Confirm the complete manufacturer Part Number before purchase.
01Check Part NumberMatch the complete ordering code on the existing unit.
02Confirm RevisionCheck suffix, hardware or firmware when applicable.
03Send a Label PhotoWe can review a clear label photo when identification is uncertain.
ORDERING PROCESS
From RFQ to Dispatch
1Submit Part Number2Verify Product Identity3Confirm Stock & Condition4Issue Quotation5Dispatch & Tracking
PRODUCT FAQ
Frequently Asked Questions
What is the memory capacity of the Allen-Bradley 1756-L61 controller?
The 1756-L61 Logix5561 controller has 2 MB of user memory for logic and 478 KB for I/O data.
Which battery models are compatible with the 1756-L61 LOGIX5561?
The module supports either the 1756-BA1 battery or the 1756-BATM battery module for memory retention.
What is the market reference price for the 1756-L61 LOGIX5561?
Observed market reference pricing is around $389.00 USD. This figure is an indicative reference price only and is not a final quotation.
