Allen-Bradley 1756-L72 ControlLogix Series Programmable Automation Controller

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.

Technical specifications for 1756-L72

ManufacturerRockwell Automation

BrandAllen-Bradley

Part Number/Catalog No.1756-L72

SeriesControlLogix

I-O Memory0.98 MB

Module TypeProcessor Module

User Memory4 MB

Nonvolatile Memory1 GB (1784-SD1 ships with every controller) 2 GB (1784-SD2)

Maximum I-O128,000

Communication1 port USB

USB Port CommunicationProgramming, configuration, and on-line edits

Maximum Analog I-O4,000

Maximum Digital I-O128,000

Current Draw (1.2 Volts DC)5 milliamps

Current Draw (5.1 Volts)800 milliamps

User Memory4MB

Power Dissipation2.5 Watts

Backplane Current (1.2 Volts DC)5 mA

Thermal Dissipation8.5 BTU per hour

Backplane Current (5.1 Volts DC)800 mA

Isolation Voltage30 Volts Continuous

Weight0.25 kg (0.55 lb)

EnclosureNone

Relative Humidity5-95 percent

Operating shock30G

UPC10612598876027

RedundancyFull Support

UNSPSC32151705

Programming LanguagesRelay ladder Structured text Function block SFC"

1756-L72EROM

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1756-L72EROMS

Armor ControlLogix Controller, 4 Megabytes Standard Memory, 128000 Max Total I/O, 18-32 Volts DC

1756-L72K

Allen Bradley ControlLogix Processor Module with 0.98 MB I-O Memory

1756-L72S

GuardLogix Controller, 0.98 MB I-O Memory, 128000 Maximum I-O, 2.5 Watts

1756-L72SK

GuardLogix Controller, 0.98 MB I-O Memory, 128000 Maximum I-O, 2.5 Watts, Conformal Coat