The expansion memory module that is known as the 1756-M2 memory module is used for various applications within harsh industrial environments. The unit is part of the ControlLogix 1756 product series introduced by Allen Bradley/Rockwell Automation. The ControlLogix system can be constructed from a variety of high-performance components like processors, controllers, memory boards, and different analog and digital modules. The ControlLogix modules are mounted in the chassis and they communicate through the ControlNet and EtherNet/IP networks. The available ControlLogix controllers have data and logic memory capacities from 750 kilobytes to 32 megabytes and they feature a backplane currents of 1.20 to 1.25 Amps at 5.1 Volts DC.
The 1756-M2 expansion memory module comes with 1 megabyte of memory capacity and an open-style enclosure. According to specifications provided by Allen Bradley, the unit has an operating temperature range of 0 to 60 degrees Celsius (32 to 140 degrees Fahrenheit) and storage temperature of -40 to 85 degrees Celsius (-40 to 185 degrees Fahrenheit). In addition to that, the 1756-M2 module has a moderate tolerance to vibration (2 G at 10 to 500 Hertz frequency) and shock (30 G), and it operates in environments with relative humidity rating of up to 95% (non-condensing). The 1756-M2 module supports emission class A (Group 1) and it has a temperature code rating of T4A/T4. The unit is designed to meet the requirements set by standards like the UL, CE, CSA, and C-Tick standards. The ESD immunity of the 1756-M2 unit per the IEC 61000-4-3 standards is 6 kiloVolts for indirect contact discharge and 8 kiloVolts for air discharge.
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| Brand | Allen Bradley / Rockwell Automation |
| Series | ControlLogix |
| Part Number | 1756-M2 |
| Type | Expansion |
| Capacity | 1 megabyte |
| Enclosure type | None (Open-style) |
| Relative humidity | 5 to 95%, non-condensing |
| Vibration | 2 G at 10 to 500 Hertz |
| Shock | 30 G |
| Emissions | Group 1, Class A |
| Operating temperature | 0 to 60 degrees Celsius (32 to 140 degrees Fahrenheit) |
| Storage temperature | -40 to 85 degrees Celsius (-40 to 185 degrees Fahrenheit) |
| IEC temperature code | T4A/T4 |
| Certification | CE, CSA, FM, C-tick, UL, etc. |
| Weight | 0.22 kilograms (7.7 ounces) |