The Allen-Bradley 1756-L72 is a ControlLogix 5572 programmable automation controller featuring 4 MB of user memory and 0.98 MB of I/O memory. It supports up to 128,000 digital I/O points and 4,000 analog I/O points, making it ideal for medium-to-large scale industrial automation applications.
Item No :
1756-L72Order(MOQ) :
1 PiecePayment :
EXWProduct Origin :
USAShipping Port :
WuhanLead Time :
3~5 daysWeight :
5kg| Specification | Description |
|---|---|
| Manufacturer | Rockwell Automation (Allen-Bradley) |
| Model | 1756-L72 |
| Product Family | ControlLogix 5572 |
| Product Type | Programmable Automation Controller (PAC) |
| User Memory | 4 MB |
| I/O Memory | 0.98 MB |
| Non-Volatile Memory | 1 GB SD card (1784-SD1) included; upgradeable with 1784-SD2 |
| Maximum Digital I/O | 128,000 points |
| Maximum Analog I/O | 4,000 points |
| Controller Tasks | 32 tasks maximum (continuous, periodic, event) |
| Programs per Task | Up to 1,000 programs per task (Logix Designer v24 or later) |
| Built-in Ports | 1 x USB 2.0 Type B (programming only) |
| Local Communication | USB 2.0 Full Speed |
| Display | On-board LCD display for diagnostics and runtime information |
| Power Dissipation | 2.5 W |
| Backplane Current Draw | 800 mA @ 5.1V DC; 5 mA @ 1.2V DC |
| Operating Temperature | 0°C to +60°C |
| Storage Temperature | -40°C to +85°C |
| Relative Humidity | 5% to 95% (non-condensing) |
| Chassis Slots | 1 |
| Weight | Approx. 0.25 kg |
| Programming Software | Studio 5000 Logix Designer v20 or later |
| Lifecycle Status | Active |
| Model | Description | Typical Application |
|---|---|---|
| 1756-L71 | ControlLogix 5571 with 2 MB user memory | Smaller applications requiring less memory |
| 1756-L73 | ControlLogix 5573 with 8 MB user memory | Larger applications with more complex logic |
| 1756-L74 | ControlLogix 5574 with 16 MB user memory | High-end, data-intensive applications |
| 1756-L75 | ControlLogix 5575 with 32 MB user memory | Maximum memory requirements for large-scale systems |
| 1756-L72S | GuardLogix safety controller with 4 MB + 2 MB safety memory | Applications requiring integrated safety control |
| 1756-L72EROM | Armor version with dual-port EtherNet/IP and 4 MB memory | Extreme environment or on-machine applications |
| 1756-ESMCAP | Energy Storage Module (replaces lithium battery) | Memory retention without battery maintenance |
Q1: What is the user memory capacity of the 1756-L72?
The 1756-L72 has 4 MB of user memory and 0.98 MB of I/O memory. The controller also includes a 1 GB Secure Digital (SD) card (1784-SD1) that provides non-volatile memory for program storage and data logging .
Q2: Does the 1756-L72 have built-in Ethernet or other communication ports?
No. Like all standard 1756-L7x series controllers, the 1756-L72 has only a USB 2.0 programming port built in. For network connectivity, you must install separate communication modules such as the 1756-EN2T (EtherNet/IP), 1756-CN2 (ControlNet), or 1756-DNB (DeviceNet) in the same chassis .
Q3: What software is required to program the 1756-L72?
The controller is programmed using Studio 5000 Logix Designer version 20 or later. Earlier versions of RSLogix 5000 may also support the controller depending on the specific revision. The controller requires firmware revision 20.012 or later .
Q4: Does the 1756-L72 require a battery for memory backup?
No. The 1756-L72 uses an Energy Storage Module (ESM), specifically the 1756-ESMCAP, instead of a traditional lithium battery. This eliminates battery maintenance and environmental disposal issues associated with lithium batteries . The 1 GB SD card also provides non-volatile storage for program backup .
Q5: What is the difference between the 1756-L72 and the 1756-L72S?
The 1756-L72 is a standard ControlLogix controller for non-safety applications. The 1756-L72S is a GuardLogix safety controller that provides 4 MB of standard memory plus 2 MB of safety memory, enabling integrated safety functions up to SIL 3 and PLe in addition to standard control.
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