
ControlLogix Logix5550 Processor with 1MB User Memory
The Allen-Bradley 1756-L1M2 is a ControlLogix 5550 controller. It has a 1 MB user available memory but it does not have a nonvolatile memory. It has the capacity to control local and remote I/O across DeviceNet, ControlNet, and Universal Remote I/O networks. It has an open-style enclosure type rating and weighs 0.35 g or 12.5 oz. This controller has Group 1, Class A emissions.
The 1756-L1M2 has an average power dissipation of 4.8 W and an average thermal dissipation of 16.4 BTU/hr. Its average backplane current at 5V DC is 1.05 A and 0.02 A at 24V DC.
The operating temperature of this controller ranges from 0 to 60 Degrees Celsius, while its storage temperature ranges from -40 to 85 Degrees Celsius. It also has a noncondensing relative humidity between 5% to 95%.
Technical specifications
| Part Number/Catalog No. | 1756-L1M2 |
| Series | ControlLogix |
| Module Type | Processor Module |
| Expansion Memory | 1 MB |
| Enclosure | Open |
| Isolation Voltage | 30 Volts Continuous |
| Operating Temperature | 32-140 Fahrenheit (0-60 Celsius) |
| Minimum Operating Current | 2 milliamps at 10 Volts DC |
| Maximum Operating Current | 3.5 milliamps at 30 Volts DC |
| Maximum Input Current, Off-State | 1.5 milliamps |
| Power Dissipation (Max) | 4.1 Watts at 60 degrees Celsius |
| Backplane Current at 5 Volts | 120 milliamps |
| Backplane Current at 24 Volts | 2 milliamps |
| Removeable Terminal Block(s) | 1756-TBCH, 1756-TBS6H |
| UPC | 10612598180988 |
Application Areas

1. Process industry automation control
As a ControlLogix series processor, 1756-L1M2 is suitable for process industries such as chemical, petroleum, and pharmaceuticals. It supports complex PID control, batch management, and safety interlocking to meet the needs of high-precision process regulation.
2. Large-scale machinery and equipment integration
This controller performs well in heavy machinery (such as metallurgical equipment and mining machinery), supports multi-axis motion control, high-speed I/O scanning, and has industrial-grade reliability such as vibration resistance and high temperature resistance.
3. Critical infrastructure monitoring
Applicable to key facilities such as electricity and water, providing redundant control, real-time data acquisition, and remote operation and maintenance functions to ensure long-term stable operation of the system and comply with industry safety standards (such as IEC 61508).
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