AB 1756-L71
AB 1756-L71
AB 1756-L71
AB 1756-L71
AB 1756-L71
AB 1756-L71
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1756-L71

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Allen-Bradley 1756-L71 is a ControlLogix 5570 chassis controller with 2 MB user memory, separate I/O memory, and temporary USB service access.
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Technical specifications for 1756-L71

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1756-L71
  • Product Family:
    ControlLogix
  • Product Type:
    ControlLogix Controller
  • Stock:
    1
  • User memory:
    2 MB
  • I/O memory:
    0.98 MB
  • Controller tasks:
    32 maximum
  • Programs per task:
    1000 beginning with Logix Designer version 24
  • Digital I/O:
    128,000 maximum
  • Analog I/O:
    4,000 maximum
  • Controller connections:
    500 maximum
  • Built-in communication:
    One USB 2.0 full-speed port for temporary local programming
  • Optional nonvolatile storage:
    1 GB 1784-SD1 supplied; 2 GB 1784-SD2 optional
  • Power dissipation:
    2.5 W
  • Current draw:
    5 mA at 1.2 V DC and 800 mA at 5.1 V DC
  • Operating temperature:
    0 to 60 °C
  • Nonoperating temperature:
    -40 to 85 °C
  • Relative humidity:
    5–95%, noncondensing
  • Slot width:
    1
  • Weight:
    0.25 kg
  • Tariff Code:
    8537101190
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Memory I/O and Networks Service Application
  • Two megabytes of user memory support standard ControlLogix 5570 projects
  • The controller supports up to thirty-two tasks and 128,000 total I/O points
  • The built-in USB port is reserved for temporary local programming and maintenance

1756-L71 is an Allen-Bradley ControlLogix 5570 chassis controller with 2 MB of user memory and 0.98 MB of I/O memory.

It executes continuous, periodic, and event tasks while relying on separate chassis communication modules for plant networks; the front USB port is for temporary programming, configuration, firmware updates, and online edits.

Before installation or replacement, verify the hardware Series, firmware, Logix Designer project, chassis power, communication-module paths, I/O ownership, energy-storage module, SD image, and controlled startup procedure.

Availability, condition, price, and shipping time for 1756-L71 are confirmed during quotation.

Allen-Bradley 1756-L71 2 MB ControlLogix Controller Manuals, Datasheets, Links

Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.

  • 1756-L71 provides two megabytes of user memory and 0.98 megabyte of I/O memory
  • The controller supports a maximum of thirty-two continuous, periodic, or event tasks
  • Beginning with Logix Designer version 24, each task can contain up to one thousand programs
  • The documented maximum is 128,000 digital I/O points and 4,000 analog I/O points
  • A maximum of five hundred controller connections is supported
  • EtherNet/IP, ControlNet, DeviceNet, and other plant networks require appropriate chassis communication modules
  • The USB 2.0 port is for temporary programming, configuration, firmware update, and online edits
  • A 1784-SD1 one-gigabyte secure digital card ships with the controller for optional nonvolatile storage
  • The installed capacitor energy-storage module must be identified before controller exchange
  • Chassis-based machine sequencing and distributed-I/O coordination
  • Process-unit control using modular ControlLogix communication and I/O hardware
  • Integrated motion and networked automation projects within documented 5570 capacity
Description
1756-L71 is an Allen-Bradley ControlLogix 5570 chassis controller with 2 MB of user memory and 0.98 MB of I/O memory.

The controller supports up to thirty-two tasks, 128,000 total digital I/O points, 4,000 analog I/O points, optional SD storage, and temporary USB programming access.

Before installation or replacement, confirm the complete catalog number, hardware Series, firmware, chassis power, communication modules, I/O ownership, energy-storage option, tested SD image, and approved Logix project archive.
Revisions

Revision Part #

Also known as

1756-L71 Ser A
1756-L71/A, Series A, Rev A
1756-L71 Ser B
1756-L71/B, Series B, Rev B
Alternative Names
1756-L71 1756L71 1756 L71 Allen-Bradley 1756-L71 Rockwell Automation 1756-L71 AB 1756-L71 ControlLogix 5571 controller
Technical notes
1756-L71 uses chassis communication modules for plant networks; its USB port is temporary local access only. Match hardware Series and firmware, preserve the approved project and SD recovery image, and document the installed energy-storage module before replacement.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Which accessories are supplied with Allen-Bradley 1756-L71?
Allen-Bradley 1756-L71 is supplied with a 1756-ESMCAP capacitor-based energy storage module, a 1 GB 1784-SD1 Secure Digital card, and a 1747-KY controller key.
Can the USB port on Allen-Bradley 1756-L71 be used as a permanent connection?
No. The USB port is intended only for temporary local programming, firmware updates, and project transfers. The USB cable must not exceed 3 m and must not contain hubs.
Why should the SD card remain installed in Allen-Bradley 1756-L71?
Rockwell Automation recommends leaving the SD card installed because the controller can write diagnostic information to it after a major nonrecoverable fault, helping with subsequent troubleshooting.
What must be checked before removing the SD card from Allen-Bradley 1756-L71?
Confirm that the SD status indicator is off and that the card is not being accessed. In hazardous locations, remove power or verify that the area is nonhazardous before inserting or removing the card.
Which energy storage module can restrict access to Allen-Bradley 1756-L71?
The optional 1756-ESMNRM energy storage module provides additional security by blocking use of the controller’s USB connection and SD card.
Which programming languages are supported by Allen-Bradley 1756-L71?
Allen-Bradley 1756-L71 supports relay ladder, structured text, function block diagram, and sequential function chart programming in the Studio 5000 Logix Designer environment.
Can Allen-Bradley 1756-L71 be used in a redundant controller system?
Yes. ControlLogix 5570 controllers support controller redundancy, but Rockwell specifies that motion applications are excluded from redundant-controller support.