Allen-Bradley 1756-L1M2 ControlLogix Processor Module 1MB Memory
Introduction:
The 1756-L1M2 is a ControlLogix 5550 processor module from Allen-Bradley. It provides 1 MB of user memory for control applications. This controller supports local and remote I/O across DeviceNet, ControlNet, and Universal Remote I/O networks.
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Product Overview
The 1756-L1M2 belongs to the ControlLogix 5550 Series. Its product type is a Processor Module. The product classification is Controllers & CPUs. The current price for this item is ¥6,850 RMB, and the product gross weight is 0.35 kg (12.5 oz) .
Rockwell Automation designed this controller under the Allen-Bradley brand for the ControlLogix platform. The 1756-L1M2 provides 1 MB of user available memory . Please note that this module does not include nonvolatile memory . It can control local I/O as well as remote I/O across multiple networks. Supported networks include DeviceNet, ControlNet, and Universal Remote I/O . Therefore, this controller suits distributed control architectures requiring flexible networking.
Technical Specifications
Memory and Processing
The 1756-L1M2 offers 1 MB of expansion memory for user programs and data. The module has an open-style enclosure rating and emissions classification of Group 1, Class A . For battery replacement, use the 1756-BA1 0.59g lithium battery. Compatible programming cables include the 1756-CP3 and the 1747-CP3 .
Power and Thermal Ratings
The average power dissipation measures 4.8 Watts . Maximum power dissipation reaches 4.1 Watts at 60°C . Average thermal dissipation is 16.4 BTU per hour . The average backplane current at 5 VDC is 1.05 Amps . At 24 VDC , the average backplane current is 0.02 Amps (20 mA) . Ensure your chassis power supply can deliver adequate current for this processor.
Temperature and Environmental Ratings
The operating temperature range spans 0 to 60°C (32 to 140°F) . The storage temperature extends from -40 to 85°C (-40 to 185°F) . Non-condensing relative humidity tolerance ranges from 5% to 95% . These specifications suit standard industrial environments.
Vibration and Shock Tolerance
Vibration handling capability reaches 2 G maximum peak acceleration at 10 to 500 Hz . Operating shock tolerance is 30 G peak for 11 milliseconds . Storage shock capacity reaches 50 G peak for 11 milliseconds . This rugged construction ensures reliable operation in demanding machinery applications.
Isolation Voltage
The isolation voltage rating is 30 Volts continuous . The module has been tested to withstand 500 Volts for 60 seconds . This isolation protects the processor from field wiring faults and transients.
Input Current Specifications
The minimum operating current is 2 milliamps at 10 Volts DC . The maximum operating current reaches 3.5 milliamps at 30 Volts DC . The maximum off-state input current is 1.5 milliamps . These low currents minimize power consumption.
Electromagnetic Compatibility (EMC)
The 1756-L1M2 offers robust EMC specifications. Conducted RF immunity reaches 10 Volts RMS with 1 kHz sine-wave 80% AM from 150 kHz to 80 MHz. ESD immunity provides 6 kV for contact discharges and 8 kV for air discharges . EFT/B immunity delivers ±2 kV at 5 kHz on communication ports and ±4 kV at 2.5 kHz on power ports . Radiated RF immunity reaches 10 V/m with 200 Hz 50% Pulse 100% AM at 900 MHz, and 10 V/m with 1 kHz sine-wave 80% AM from 30 MHz to 1000 MHz. Therefore, this controller operates reliably in electromagnetically noisy industrial environments.
Compatible Removable Terminal Blocks
Compatible removable terminal blocks include 1756-TBCH and 1756-TBS6H . These terminal blocks simplify field wiring connections.
Installation Guide
Follow these steps to install your 1756-L1M2 correctly.
Power Down the Chassis: Disconnect power from the ControlLogix chassis completely. This prevents electrical damage during installation.
Select a Slot: Choose an available slot in the ControlLogix chassis. The 1756-L1M2 occupies one slot.
Insert the Module: Align the 1756-L1M2 with the slot guides. Push firmly until the module seats into the backplane connector.
Secure the Module: Tighten the retaining screws at the top and bottom. This secures the processor module in place.
Install the Battery: Insert the 1756-BA1 lithium battery into the battery compartment. This maintains the real-time clock during power loss.
Connect Programming Cable: Attach a 1756-CP3 or 1747-CP3 cable between the controller and your programming terminal.
Apply Power: Restore power to the ControlLogix chassis. Verify that the processor powers up without errors.
Download User Program: Transfer your control program to the 1 MB user memory. Use RSLogix 5000 or Studio 5000 programming software.
Configure Network Connections: Set up DeviceNet, ControlNet, or Universal Remote I/O networks as required. Verify communication with remote I/O modules.
Package List
1 x 1756-L1M2 ControlLogix 5550 Processor Module
1 x 1756-BA1 lithium battery (pre-installed or included)
2 x Module retaining screws (pre-installed)
1 x Installation instruction manual
Note: Programming software, communication cables, and removable terminal blocks are sold separately. This module does not include nonvolatile memory.
Frequently Asked Questions (FAQ)
1. Does the 1756-L1M2 include nonvolatile memory?
No, the 1756-L1M2 does not include nonvolatile memory . Store your user program on external media or use a separate nonvolatile memory module if permanent storage is required.
2. What networks does this controller support for remote I/O?
The 1756-L1M2 supports DeviceNet, ControlNet, and Universal Remote I/O networks. This flexibility allows integration with various distributed I/O architectures.
3. What battery does the 1756-L1M2 require?
This processor requires the 1756-BA1 0.59g lithium battery for clock backup. Replace the battery when the low battery indicator lights to prevent clock loss during power cycles.
4. What programming cables work with this controller?
Compatible programming cables include the 1756-CP3 and the 1747-CP3 . Both cables connect the controller's RS-232 port to a computer's serial port or USB-to-serial adapter.
5. What is the operating temperature range for this module?
The 1756-L1M2 operates reliably between 0 and 60°C (32 to 140°F) . For storage, the temperature range extends from -40 to 85°C (-40 to 185°F) . Install the controller in a temperature-controlled environment for optimal performance.