Description
ROCKWELL 1756-L72S/1756-L73 Programmable Automation Controller
1756-L72S-4
The Allen – Bradley 1756 – L72S is not just another controller; it’s a safeguard for industrial operations. It’s part of the GuardLogix 5570 controller family, designed to work in tandem with the 1756 – L7SP safety module to achieve Safety Integrity Level 3 (SIL 3) or Performance Level e / Category 4 (Cat. 4 / PLe) compliance. This makes it ideal for industries where safety is non – negotiable, such as chemical plants, oil refineries, and automotive manufacturing facilities. By integrating into larger industrial control systems, the 1756 – L72S ensures that operations run smoothly while maintaining the highest safety standards, preventing costly downtime and potential hazards.
| Label |
Specification |
| Model Number |
1756 – L72S |
| Brand |
Allen – Bradley |
| Type |
Programmable Automation Controller (PAC) |
| Input Voltage |
10 – 30 V DC |
| Operating Temp |
-40°C to +70°C |
| Communication Method |
Ethernet/IP, ControlNet, DeviceNet |
| Mounting |
Rack – mountable (fits in Controllogix 1756 chassis) |
| Weight |
Approximately 1.36 kg |
| Certifications |
UL, cUL, CE, ATEX, IECEx |
| Dimensions |
171.45 mm x 111.15 mm x 82.55 mm |
| IP Rating |
IP20 |
| Protocols Supported |
CIP Safety, EtherNet/IP, ControlNet, DeviceNet |
The Allen – Bradley 1756 – L72S offers an array of functional strengths that set it apart in the industrial automation market. Its dual – processor architecture ensures lightning – fast data processing, allowing it to handle complex control algorithms and large volumes of I/O data with ease. Whether it’s analyzing sensor inputs in real – time or executing precise control commands, the 1756 – L72S delivers exceptional performance, reducing latency and enhancing overall system responsiveness.
With a generous 4MB of user memory, 2MB of safety memory, and 0.98MB of I/O memory, this controller provides ample space for storing intricate control programs and historical data. The optional 1GB (1784 – SD1) or 2GB (1784 – SD2) Secure Digital card offers additional non – volatile storage, ensuring that critical data is retained even during power outages. The 1756 – L72S can support up to 128,000 digital I/O and 4000 analog I/O, making it suitable for large – scale industrial applications. Its ability to communicate over multiple industrial protocols like Ethernet/IP, ControlNet, and DeviceNet ensures seamless interoperability with a wide range of devices, from sensors and actuators to HMIs and other controllers.
1756-L72S
Designed for the rigors of industrial environments, the 1756 – L72S features a rugged build that can withstand extreme temperatures, vibrations, and electrical interference. Its modular design allows for easy installation and maintenance, and it can be mounted in any slot of the Controllogix 1756 chassis, with the option to install multiple controllers in the same chassis for enhanced system flexibility.
The Allen – Bradley 1756 – L72S shines in various industrial use cases. In the automotive manufacturing industry, it plays a crucial role in managing the complex automation systems on the production line. It controls the movement of robotic arms, monitors the quality of parts, and coordinates the entire assembly process, ensuring high – precision manufacturing and reduced errors. By integrating with other devices through Ethernet/IP and DeviceNet, it enables real – time communication and data sharing, optimizing production efficiency.
In the power generation sector, the 1756 – L72S is used to control and monitor generators, turbines, and electrical distribution systems. It ensures stable power output by precisely regulating parameters such as voltage, frequency, and load. With its safety – rated capabilities, it safeguards critical power infrastructure, preventing potential failures and ensuring a reliable power supply to the grid. In a combined – cycle power plant, for example, the 1756 – L72S can manage the intricate interactions between the gas turbine, steam turbine, and generator, maximizing energy efficiency.
1756-L72S
Several models are closely related to the Allen – Bradley 1756 – L72S.
- 1756 – L71 – A base – level variant with less memory and processing power, suitable for smaller – scale industrial applications where cost – effectiveness is a priority.
- 1756 – L73S – Offers enhanced processing speed and additional memory, making it ideal for more complex industrial processes that require higher data handling capabilities.
- 1756 – L74S – Features advanced communication options, including more Ethernet ports, enabling better connectivity in large – scale industrial networks.
- 1756 – L75S – Designed for applications with strict safety requirements, providing enhanced safety features and higher SIL ratings.
- 1756 – L72ER – A ruggedized version, built to withstand harsher environmental conditions, suitable for outdoor or remote industrial installations.
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1756-L72S
Installing the Allen – Bradley 1756 – L72S requires careful planning. When mounting it in the Controllogix 1756 chassis, ensure that the chassis is properly grounded to prevent electrical interference. All electrical connections should be made according to the provided wiring diagrams, and the power supply should be within the specified 10 – 30 V DC range. For network connections, use shielded cables to minimize signal loss and interference. When configuring the controller, use Rockwell Automation’s Studio 5000 software, which provides a user – friendly interface for programming and commissioning.
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