1756-L72 ControlLogix Series Programmable Automation Controller (PAC)

Description

1756-L72 ControlLogix Series Programmable Automation Controller (PAC)

The Allen-Bradley 1756-L72 is a ControlLogix Series Programmable Automation Controller (PAC).

It has an available 4 MB user memory for data and logic and 0.98 MB I/O memory. The controller ships

with a 1 GB SD card, the 1784-SD1, that you can use as optional nonvolatile memory storage. You

can also upgrade it to 2 GB via the 1784-SD2 card if the storage is not enough for your use. It is

recommended that the SD card is installed to the controller and to only use those that are sold by

Rockwell Automation, as these cards have been fully tested to work with the controllers. Using other

SD cards poses a risk of experiencing data loss or corruption. The SD cards are primarily used to store

diagnostic data that is written automatically when a fault occurs. These data are used by Rockwell Automation

for troubleshooting purposes. The 1756-L72 controller also comes with three capacitor energy storage

modules. The 1756-ESMCAP/1756-ESMCAPK is a removable module available in every controller.

Another removable module is the 1756-ESMNSE/1756-ESMNSEK that has no residual WallClockTime

power backup. The only nonremovable module is the 1756-ESMNRM/1756-ESMNRMK that helps

prevent USB connection and SD card use to help secure the controller.

1756-L71S

The Allen-Bradley 1756-L72 belongs to the most recent ControlLogix product category. This part

number represents a ControlLogix controller with 4Mb user memory and pre-allocated I/O memory capacity of 0.98 MB.

The 1756-L7x Controllers introduced several upgrades. For the non-volatile memory, this controller used

Secure Digital (SD) cards. By default, this controller is shipped with a 1GB non-volatile memory.

Replacement modules for this non-volatile memory are 1756-SD1 and 1756-SD2. Additionally, this

controller does not use batteries. Instead of RS232 communication port, this controller has USB

communication port that functions similar to the RS232 however, more robust and does not require

expensive communication cables. If required, the controller’s integrated memory ma be upgraded or downgraded with the use of the Flash utility tool.

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