The Allen‑Bradley 1756‑L61 is a ControlLogix® 5561 programmable automation controller from Rockwell Automation. It offers 2 MB of user memory and supports up to 128,000 digital I/O or 4,000 analog I/O points, making it suitable for medium‑scale automation and process control applications.
Item No :
1756-L61Order(MOQ) :
1Payment :
EXWProduct Origin :
USALead Time :
3-5daysWeight :
0.5KG| Specification | Description |
|---|---|
| Manufacturer | Rockwell Automation (Allen‑Bradley) |
| Model | 1756‑L61 |
| Product Family | ControlLogix® 5561 |
| Product Type | Programmable Automation Controller (PAC) |
| User Memory | 2 MB |
| I/O Memory | 478 KB |
| Max Digital I/O | 128,000 points |
| Max Analog I/O | 4,000 points |
| Non‑Volatile Storage | CompactFlash card (e.g., 1784‑CF128), recommended for program backup |
| Max Controller Connections | 250 |
| Tasks / Programs | 32 tasks, up to 100 programs per task |
| Built‑in Port | 1 x RS‑232 serial port (DF1, DH‑485, ASCII, Modbus via logic) |
| Supported Motion | Embedded SERCOS interface |
| Backplane Current | 1.2 A @ 5.1V DC; 14 mA @ 24V DC |
| Power Dissipation | 3.5 W |
| Operating Temperature | 0°C to +60°C |
| Protection Class | IP20 (open‑type, rack‑mounted) |
| Programming Software | RSLogix 5000 / Studio 5000 Logix Designer (supports up to v20.019) |
| Battery Options | Series A: 1756‑BA1, 1756‑BATM; Series B: 1756‑BA2 |
| Lifecycle Status | Discontinued (replaced by 1756‑L71) |
| Model | Description | Typical Application |
|---|---|---|
| 1756‑L71 | Primary functional replacement – 2 MB memory, built‑in USB, SD card slot, active product | New projects or system upgrades |
| 1756‑L62 | 4 MB memory variant of the same generation, also discontinued | Applications requiring more memory within legacy systems |
| 1756‑L63 | 8 MB memory variant, discontinued | Large‑scale legacy applications |
| 1756‑L61S | GuardLogix safety version of the L61 | Applications requiring safety certification (SIL3/PLe) |
| 1756‑EN2T | EtherNet/IP communication module | Adding Ethernet network connectivity to L61 |
| 1784‑CF128 | 128 MB CompactFlash memory card | Non‑volatile program storage |
| 1756‑BA1 / 1756‑BATM | Replacement battery for Series A L61 controllers | Memory retention backup |
| 1756-A10 | 1794-IE8XT | 1769-IF4I |
| 1756-A13 | 1794-IF2XOF2I | 1769-IF4XOF2 |
| 1756-A17 | 1794-IF4I | 1756-OF4 |
| 1756-A4 | 1794-IF8IH | 1769-IG16 |
| 1756-A7 | 1794-IG16 | 1769-IM12 |
| 1756-BA1 | 1794-IH16 | 1769-IQ16 |
| 1756-BA2 | 1794-IJ2 | 1769-IQ16F |
| 1756-BATA | 1756-IF16 | 1769-IQ32 |
| 1756-BATM | 1794-IM8 | 1769-IQ32T |
| 1756-CFM | 1794-IP4 | 1769-IQ6XOW4 |
| 1756-CN2 | 1794-IR8 | 1769-IR6 |
| 1756-CN2R | 1794-IRT8 | 1769-IT6 |
| 1756-CNB | 1794-IRT8K | 1756-L61 |
Q1: Is the 1756‑L61 still in production?
No. The 1756‑L61 has been discontinued by Rockwell Automation . The recommended functional replacement is the 1756‑L71, which offers enhanced features including a USB programming port and SD card slot .
Q2: What is the user memory capacity of the 1756‑L61?
The controller has 2 MB of user memory and 478 KB of I/O memory .
Q3: Does the 1756‑L61 have built‑in Ethernet?
No. The L61 does not have an embedded Ethernet port. It requires a separate communication module such as a 1756‑ENBT or 1756‑EN2T for EtherNet/IP connectivity .
Q4: What is the difference between Series A and Series B of the 1756‑L61?
The main differences are:
Battery type: Series A uses 1756‑BA1 or 1756‑BATM; Series B uses 1756‑BA2 .
CompactFlash access: Series B allows front‑accessible CompactFlash card insertion/removal .
Firmware: Series B requires revision 13.40 or later .
Q5: Can the 1756‑L61 be used as a direct replacement for the older 1756‑L55?
Yes. The L61 is a direct upgrade path from the L55. In RSLogix 5000, you can change the controller type in the project properties from 1756‑L55 to 1756‑L61 and download the converted program . However, once converted, the project cannot be loaded back to an L55 controller.
The Allen-Bradley 1756-EN2TR is a dual-port EtherNet/IP communication module for the ControlLogix platform, designed to support Device Level Ring (DLR) topology for single-fault tolerant networks.
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The Allen-Bradley 1756-L73XT is an 8 MB ControlLogix-XT 5570 series controller from Rockwell Automation, specifically engineered for extreme industrial environments. The "XT" designation indicates conformal coating applied to the circuit board and an extended operating temperature range of -25°C to +70°C (-13°F to +158°F), enabling reliable operation in harsh conditions without climate-controlled enclosures.
The Allen-Bradley 1756-L71 is a ControlLogix® 5570 series programmable automation controller (PAC) from Rockwell Automation. With 2 MB of user memory and 0.98 MB of I/O memory, it is designed for medium to large-scale industrial automation and process control applications.
The Allen‑Bradley 1756‑L62 (also known as the ControlLogix 5562 processor) is a standard controller from Rockwell Automation's ControlLogix® 5570 family. Featuring 4 MB of user memory, it was designed for complex control of medium to large‑scale industrial processes in factory automation and process applications.
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The Allen‑Bradley 1756‑L61 is a ControlLogix® 5561 programmable automation controller from Rockwell Automation. It offers 2 MB of user memory and supports up to 128,000 digital I/O or 4,000 analog I/O points, making it suitable for medium‑scale automation and process control applications.
The Allen-Bradley 1756-L71 is a ControlLogix® 5570 series programmable automation controller (PAC) from Rockwell Automation. With 2 MB of user memory and 0.98 MB of I/O memory, it is designed for medium to large-scale industrial automation and process control applications.
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