Image is for illustrative purposes only. Please refer to product description.
- Manufacturer
- Allen-Bradley
- Manufacturer part number
- 1756-L74
- Product family
- ControlLogix and GuardLogix Controllers (1756)
- Category
- PLCs and I/O › CPU and processor modules
- Technical datasheet
- Data sheet
Specifications
| Attribute | Value |
|---|---|
| Type | ControlLogix controller |
| Manufacturer lifecycle | Active |
| Controller tasks | 32 tasks, including a combination of one continuous, periodic, and event tasks 32 programs/tasks prior to RSLogix 5000® programming software, version 15.01.00 100 programs/task beginning with RSLogix 5000 programming software, version 15.01.00 1000 programs/task beginning with Logix Designer application, version 24.00.00 |
| Built-in communication ports | 1-port USB |
| Communication options | EtherNet/IP, ControlNet, DeviceNet, Data Highway Plus, Remote I/O, SERCOS, Third-party process and device networks |
| USB port communication | Programming, configuration, firmware update, and online edits only |
| Controller connections supported max | 500 |
| Network connections, per network module | 1000 I/O; 528 EtherNet/IP; 512 TCP (1756-EN4TR) 256 EtherNet/IP; 128 TCP (1756-EN2x) 128 EtherNet/IP; 64 TCP (1756-ENBT) 100 ControlNet (1756-CN2/A) 40 ControlNet (1756-CNB/D, 1756-CNB/E) 128 ControlNet (1756-CN2/B) |
| Controller redundancy | Full support |
| Integrated motion | SERCOS interface, Analog options (encoder input, LDT input, SSI input), Integrated Motion on the EtherNet/IP network |
| Programming languages | Relay ladder logic, Structured text, Function Block Diagram, Sequential function chart (SFC) |
| User memory | 16 MB |
| I/O memory | 0.98 MB |
| Nonvolatile memory storage | 1 GB Secure Digital (SD) card (1784-SD1), ships pre-installed in the controller |
| Digital I/O max | 128,000 |
Show all 43 specificationsShow fewer specifications
| Analog I/O max | 4000 |
|---|---|
| Total I/O max | 128,000 |
| Energy storage module | 1756-ESMCAP, 1756-ESMCAPK capacitor energy storage module (removable, ships installed with every controller) 1756-ESMNSE, 1756-ESMNSEK capacitor energy storage module (removable, no residual WallClockTime power backup) 1756-ESMNRM, 1756-ESMNRMK capacitor energy storage module (non-removable, helps prevent USB connection and SD card use to help secure the controller) |
| Current draw @ 1.2V DC | 5 mA |
| Current draw @ 5.1V DC | 800 mA |
| Power dissipation | 2.5 W |
| Thermal dissipation | 8.5 BTU/hr |
| Isolation voltage | 30V (continuous), basic insulation type, USB port-to-system, Compliant and tested according to IEC/UL 61010-1 |
| USB port | USB 2.0, full speed (12 Mbps) |
| Weight approx | 0.25 kg (0.55 lb) |
| Slot width | 1 |
| Module location | Chassis-based, any slot |
| Chassis | 1756-A4, 1756-A4K, 1756-A7, 1756-A7K, 1756-A10, 1756-A10K, 1756-A13, 1756-A13K, 1756-A17, 1756-A17K |
| Power supply, standard | 1756-PA50, 1756-PA50K, 1756-PA72, 1756-PA72K, 1756-PA75, 1756-PA75K, 1756-PB50, 1756-PB50K 1756-PB72, 1756-PB72K, 1756-PB75, 1756-PB75K, 1756-PC75, 1756-PH75 |
| Power supply, redundant | 1756-PA75R, 1756-PA75RK, 1756-PB75R, 1756-PB75RK, 1756-PSCA2, 1756-PSCA2K |
| Wire category | 3 - on USB port |
| Temperature code | T4 |
| Enclosure type rating | None (open-style) |
| Temperature, operating | 0 °C ≤ Ta ≤ +60 °C (+32 °F ≤ Ta ≤ +140 °F) |
| Temperature, nonoperating | -40…+85 °C (-40…+185 °F) |
| Relative humidity | 5…95% noncondensing |
| Vibration | IEC 60068-2-6 (Test Fc, Operating) |
| Shock, operating | IEC 60068-2-27 (Test Ea, Unpackaged Shock) |
| Shock, nonoperating | IEC 60068-2-27 (Test Ea, Unpackaged Shock) |
| Emissions | IEC 61000-6-4 |
| ESD immunity | IEC 61000-4-2 |
| Radiated RF immunity | IEC 61000-4-3 |
| Conducted RF Immunity | IEC 61000-4-6 (Not applicable: USB is a temporary programming port.) |
Description
The Allen-Bradley 1756-L74 is the ControlLogix 16 MB Controller, listed by Rockwell Automation with the lifecycle status Active Mature. According to Rockwell technical data 1756-TD001, it has 16 MB of user memory, 0.98 MB of I/O memory and a 1 GB Secure Digital card (1784-SD1) that ships pre-installed. Rockwell lists a maximum of 500 controller connections, 128,000 total I/O and 4000 analog I/O. It has a 1-port USB 2.0 full speed connection, occupies one slot and has an operating temperature of 0 to +60 °C.
Application: PLC controller
Used with: ControlLogix 1756 chassis
What is the 1756-L74 used for?
In a ControlLogix system the 1756-L74 is the controller module that runs the control program in a 1756 chassis. Rockwell lists support for EtherNet/IP, ControlNet, DeviceNet, Data Highway Plus, Remote I/O and SERCOS, along with integrated motion and full controller redundancy. The USB port is for programming, configuration, firmware update and online edits only.
Key features
- 16 MB user memory and 0.98 MB I/O memory
- Up to 500 controller connections supported
- Ladder logic, structured text, function block diagram and SFC
- 1 GB SD card ships pre-installed in the controller
- Chassis-based module, single slot, any slot location
Documents and Resources
Associated Products
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Product Questions
Is the 1756-L74 discontinued?
No. Its manufacturer lifecycle status is Active.
Can another Allen-Bradley ControlLogix and GuardLogix Controllers part replace it?
Potential replacements must be checked against the required ratings, dimensions and connections. Sharing a family name does not establish interchangeability.
Do you ship worldwide?
Yes. TimControls ships worldwide. Parts usually ship within 3 to 7 working days of order confirmation, and the exact lead time and shipping options are stated on your quote. Include your delivery country and postal code when you ask for a quote.
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