The Allen Bradley 1756-L1M3 is a ControlLogix 5550 controller that has a user available memory of 2 Mb and an I/O memory of 150 kb. It does not have a nonvolatile memory nor an enclosure. The 1756-L1M3 controller weighs 0.36 grams or 12.7 ounces and has emissions of Group 1, Class A.
This controller has a peak backplane current of 1.20 Amps at 5.1 Volts DC and 0.02 Amps at 24 Volts DC. It has an average power dissipation of 5.4 Watts and an average thermal dissipation of 18.4 BTU/hour. It also has an isolation voltage of 30 Volts. The 1756-L1M3 has been tested to withstand 500 Volts for 60 seconds. The operating temperature of the 1756-L1M3 controller ranges from 0 to 60 Degrees Celsius, while its storage temperature is from -40 to 85 Degrees Celsius. A noncondensing relative humidity of 5% to 95% exists with this controller. A vibration of the 1756-L1M3 controller is a 2.0 G maximum peak acceleration at 10 to 500 Hertz. Its operating shock is 30 G peak for 11 milliseconds, while its storage shock is 50 G peak for 11 milliseconds. The 1756-L1M3 controller has an ESD immunity of 6 kilovolts for contact discharges and 8 kV for air discharges. It also has a radiated RF immunity of 10 Volts/m with 1 kilohertz sine-wave 80%AM from 30 Megahertz to 1000 Megahertz and 10 Volts/m with 200 Hertz 50% Pulse 100%AM at 900 Megahertz. Its EFT/B immunity is +/-4 kilovolts at 2.5 kilohertz on power ports and +/-2 kilovolts at 5 kilohertz on communication ports and its conducted RF immunity is 10Vrms with 1 kilohertz sine-wave 80%AM from 150 kilohertz to 80 kilohertz. The programming cables compatible with the 1756-L1M3 are the serial cable category 3 1756-CP3 and 1747-CP3 cables, while the replacement battery compatible is the 1756-BA1 0.59 lithium battery only.
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| Manufacturer | Rockwell Automation |
| Brand | Allen Bradley |
| Part Number/Catalog No. | 1756-L1M3 |
| Series | ControlLogix |
| Module Type | Processor Module |
| Expansion Memory | 2 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 |