The Allen Bradley 1764-MM3 is a memory module. This memory module is installed in the Allen-Bradley MicroLogix 1500 module. The memory size of this module is 32KB. This module functions as a backup module so that it can store user programs and data. The 1764-MM3 offers very high security. Users do not have to worry if there is a problem. This module functions as a data file and as memory protection. The 1764-MM3 can also perform auto recovery through the power cycle. The working temperature range of this module is from 0-60 °C (32-140 °F). The storage temperature range for this module is -40-85 °C (-40-185 °F). The Allen-Bradley 1764-MM3 can withstand an operating shock of up to 30g (3 pulses, 11 ms). The nonoperating shock for this module is 50g (3 pulses, 11 ms).
The Allen-Bradley 1764-MM3 is made for use in an industrial environment with Pollution Level 2, in Category II applications (as defined in the IEC 60664-1 publication). Please remember that this module can operate at an altitude of up to 2000 meters without derating. If you connect or disconnect the terminal block cable or if you insert or discharge the module when the power is on, an electric arc can occur. This may cause an explosion in hazardous locations. Make sure the power is removed or that the area is not dangerous before doing any maintenance.