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CONTROLLOGIX 5570 CONTROLLER
1756-L71
ControlLogix 5571 Controller · 2 MB User Memory
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1756-L71
CONTROLLOGIX 5571
2 MB CONTROLLER
LOGIX 5570
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01 / PROCESSING
2 MB User Memory
The 1756-L71 provides 2 MB of memory for controller data and logic. The controller family uses different memory capacities across the 5570 range, allowing the application size to determine the appropriate controller class.
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02 / I/O DATA
0.98 MB I/O Memory
The 1756-L71 provides 0.98 MB, or approximately 1006 KB, of I/O memory. This memory allocation is distinct from the 2 MB user memory available for data and logic.
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03 / NETWORKING
Separate Communication Modules
The standard 1756-L71 does not contain an embedded EtherNet/IP port. Network connectivity is provided through chassis-based communication modules selected for the required network architecture.
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04 / MOTION
Up to 100 Motion Axes
The controller supports up to 100 motion axes. Motion capability is integrated into the Logix control environment rather than requiring the controller to be replaced by a dedicated motion-only processor.
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05 / TASK STRUCTURE
32 Tasks · Up to 1000 Programs per Task
The ControlLogix 5570 controller architecture supports 32 tasks and up to 1000 programs per task. Event tasks are supported for all event triggers. This structure allows the controller project to separate continuous and event-driven execution requirements.
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DIGITAL I/O CAPACITY
128,000 max.
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ANALOG I/O CAPACITY
4,000 max.
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NONVOLATILE STORAGE
1784-SD1 / 1 GB
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MOTION SUPPORT
100 axes
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| Parameter | 1756-L71 | Parameter | 1756-L71 |
| Controller Family | ControlLogix 5570 | Controller Type | ControlLogix 5571 |
| User Memory | 2 MB | I/O Memory | 0.98 MB / 1006 KB |
| Local Programming Port | 1 USB | Embedded EtherNet/IP | No |
| Motion Axes | 100 maximum | Digital I/O | 128,000 maximum |
| Analog I/O | 4,000 maximum | Total I/O | 128,000 maximum |
| Nonvolatile Storage | 1 GB SD card option | Storage Device | 1784-SD1 |
| Controller Tasks | 32 | Programs per Task | Up to 1000 |
| Power Supply Requirement | 800 mA @ 5.1 VDC | 1.2 VDC Current | 5 mA |
| Power Dissipation | 2.5 W at full load | Display | 4-character alphanumeric |
| Replacement Energy Module | 1756-ESMCAP | Controller Mounting | 1756 ControlLogix chassis |
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2 MB
1756-L71
2 MB user memory
0.98 MB I/O memory Standard 5570 controller USB programming port BASE MEMORY CLASS
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4 MB
1756-L72
4 MB user memory
0.98 MB I/O memory Same 5570 family USB programming port DOUBLE MEMORY
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8 MB
1756-L73
8 MB user memory
0.98 MB I/O memory Same standard architecture USB programming port LARGER PROJECT SPACE
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16 MB
1756-L74
16 MB user memory
0.98 MB I/O memory Same 5570 family USB programming port HIGHER MEMORY
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32 MB
1756-L75
32 MB user memory
0.98 MB I/O memory Same 5570 family USB programming port MAXIMUM 5570 MEMORY
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At AMIKON, our mission is to support a more sustainable and efficient global industrial supply chain.
With more than 1 million hard-to-find industrial parts in global inventory, we help system integrators and suppliers reduce unexpected shortages and extended lead times. Long-term industrial asset partnerships across multiple industries support global access to new, discontinued and difficult-to-source industrial parts, equipment and machinery.
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SALES CONTACT
Miya Zheng
Sales Manager
AMIKON Limited |
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| 01 |
Can 1756-L71 be used directly on an EtherNet/IP network without adding a communication module?
No. The standard 1756-L71 does not have an embedded EtherNet/IP port. Its local programming connection is USB, while EtherNet/IP connectivity is provided through a suitable 1756 chassis communication module. This distinction is important when replacing a controller in an existing Ethernet-based ControlLogix system.
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| 02 |
Is 1756-L71 compatible with a ControlLogix application that needs more than 2 MB of controller data and logic memory?
The 1756-L71 provides 2 MB of user memory for data and logic. If the existing application exceeds that capacity, a higher-memory 5570 controller such as the 1756-L72, 1756-L73, 1756-L74 or 1756-L75 may be required. The appropriate controller should be selected after considering the actual project memory requirement and system configuration.
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| 03 |
What should be checked when replacing an installed 1756-L71 with another controller?
Check the controller catalog number, series, firmware compatibility, project memory requirements, chassis arrangement, communication modules, SD-card usage and installed energy-storage module. The USB port is intended for temporary local programming rather than permanent field communication, so the existing network architecture should also be reviewed before replacement.
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| 04 |
Does 1756-L71 provide enough motion capacity for a ControlLogix motion application?
The 1756-L71 supports up to 100 motion axes. The actual application must still be checked for its motion configuration, network architecture, drive interfaces and controller memory usage. The 100-axis figure describes the controller's supported motion-axis capacity rather than guaranteeing that every project can operate at that limit under identical conditions.
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| 05 |
Can 1756-L71 replace 1756-L71S when the memory size appears to be the same?
No direct substitution should be assumed. The 1756-L71 is a standard ControlLogix controller, while the 1756-L71S belongs to the GuardLogix safety-controller family and includes separate safety memory and safety functionality. A replacement should match the control and safety architecture of the installed application rather than memory capacity alone.
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