The 1784-SD2 memory card is a secure digital (SD) memory card that has been manufactured and designed by Allen-Bradley for the ControlLogix 5370 controllers. This specific part is intended to expand the storage memory of any of these controllers with the main objective being to enhance their capability to store the data and applications related to programming. This kind of memory provides data security, and this means that the content can be protected from erasure or modification when needed. This helps to prevent non-authorized users from deleting data that is essential for the application process and overall programming of the controller. The Allen-Bradley 1784-SD2 secure digital (SD) memory card provides a capacity of 2 GB and it needs to be inserted in any of the slots that are available on the controller. This card also has a write-protect notch and a cass password capability.

The Allen-Bradley 1784-SD2 secure digital (SD) memory card does not come with the controller that it will be installed in. It needs to be ordered separately if the controller's operating conditions require a higher non-volatile memory capacity than what it comes with. This card has an approximate weight of 1.76 grams. The compatible controllers can be programmed to write information on this card or to use it as a definitive storage device. The Allen-Bradley 1784-SD2 secure digital (SD) memory card can operate at a temperature of -25 to 70 degrees Celsius and it can withstand vibrations of 2 G at a frequency of 10 to 500 Hertz and shocks of up to 30 G during operations. These conditions can affect the efficiency of this card. Another important feature of 5370 controllers is that they can save or load from a nonvolatile memory like this one on powerup.